There are loads!

adman

agribusinessman

aidman

airman

airwoman

alderman

alderwoman

almsman

anchorman

anchorwoman

antihuman

antiman

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artilleryman

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axeman

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boogeyman

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horseman

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houseman

human

huntsman

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inhuman

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leman

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madwoman

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man

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needlewoman

newsman

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nobleman

noblewoman

nonhuman

nonman

nurseryman

oarsman

oarswoman

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outdoorsman

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pitchwoman

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salaryman

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servicewoman

shaman

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spaceman

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stuntwoman

subhuman

superhuman

superman

supersalesman

superwoman

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ultrahuman

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woman

woodman

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workingwoman

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workwoman

yachtman

yachtsman

yardman

yeggman

yeoman

man

adman

atman

axman

daman

human

leman

liman

reman

roman

toman

unman

woman

aidman

airman

ashman

ataman

axeman

badman

bagman

barman

batman

bayman

bowman

busman

cabman

caiman

carman

cayman

cowman

desman

dolman

firman

flyman

foeman

gagman

gasman

German

gunman

hetman

iceman

lawman

layman

legman

madman

merman

nonman

oilman

outman

penman

pitman

potman

preman

ragman

rodman

seaman

shaman

skyman

socman

taxman

tinman

titman

vanman

yeoman

almsman

antiman

automan

baseman

batsman

beadman

bedeman

bellman

birdman

boatman

bogyman

bondman

bookman

bushman

caveman

Chapman

clubman

crewman

daysman

decuman

deskman

doorman

drayman

dustman

fireman

flagman

footman

foreman

freeman

frogman

gateman

gleeman

goodman

gripman

hackman

hangman

hanuman

headman

herdman

inhuman

jazzman

junkman

juryman

kinsman

kirkman

landman

leadman

lensman

liftman

lineman

linkman

mailman

meatman

messman

milkman

newsman

oarsman

ottoman

overman

packman

pikeman

plowman

postman

propman

pullman

reedman

rodsman

sagaman

sandman

seedman

shipman

shopman

showman

sideman

snowman

sockman

sokeman

swagman

taximan

teleman

tollman

tongman

turfman

unhuman

wingman

wireman

woodman

woolman

workman

yardman

yeggman

airwoman

alderman

bailsman

bandsman

bargeman

beadsman

bedesman

bluesman

boardman

boatsman

bogeyman

bondsman

boogyman

brakeman

chainman

chairman

chessman

choreman

clansman

coachman

colorman

corpsman

cragsman

dairyman

dalesman

dragoman

dutchman

earthman

everyman

ferryman

foilsman

freedman

freshman

fugleman

funnyman

gamesman

glassman

gownsman

handyman

headsman

helmsman

henchman

herdsman

horseman

hotelman

houseman

huntsman

landsman

laywoman

leadsman

liegeman

linesman

linksman

madwoman

marksman

moneyman

motorman

nobleman

nonhuman

panhuman

pitchman

pivotman

placeman

pointman

prehuman

pressman

radioman

raftsman

ranchman

reinsman

rifleman

routeman

salesman

seedsman

sheepman

sonarman

soundman

spaceman

spearman

stickman

stillman

stockman

stuntman

subhuman

superman

swingman

swordman

talesman

talisman

tallyman

townsman

trackman

trainman

trashman

truckman

verseman

watchman

waterman

weighman

whaleman

wheelman

woodsman

yachtman

anchorman

antihuman

antiwoman

attackman

bondwoman

boogerman

boogeyman

cameraman

cattleman

charwoman

churchman

clergyman

cornerman

cracksman

craftsman

deathsman

draftsman

ealdorman

exciseman

fellowman

fisherman

forewoman

garageman

gentleman

grantsman

groomsman

guardsman

guildsman

kinswoman

letterman

liveryman

lumberman

middleman

minuteman

newswoman

oarswoman

ombudsman

oysterman

pantryman

patrolman

plainsman

plantsman

policeman

quarryman

repairman

roundsman

safetyman

salaryman

schoolman

selectman

shantyman

signalman

spoilsman

spokesman

sportsman

stableman

statesman

steersman

strongman

switchman

swordsman

tillerman

timberman

tradesman

tribesman

venireman

vestryman

washerman

washwoman

wheelsman

wisewoman

workwoman

yachtsman

alderwoman

cavalryman

chairwoman

cochairman

councilman

counterman

countryman

defenceman

defenseman

everywoman

expressman

foretopman

freedwoman

garbageman

groundsman

harvestman

highwayman

horsewoman

husbandman

infrahuman

journeyman

laundryman

lobsterman

longbowman

markswoman

midshipman

militiaman

missileman

noblewoman

nurseryman

pitchwoman

poultryman

protohuman

saleswoman

scrubwoman

serviceman

stuntwoman

superhuman

superwoman

townswoman

trawlerman

triggerman

ultrahuman

weatherman

workingman

anchorwoman

assemblyman

businessman

camerawoman

churchwoman

clergywoman

congressman

craftswoman

crossbowman

deliveryman

draughtsman

fisherwoman

gentlewoman

infantryman

merchantman

needlewoman

outdoorsman

policewoman

prefreshman

spokeswoman

sportswoman

trencherman

washerwoman

artilleryman

backcourtman

backwoodsman

cochairwoman

committeeman

councilwoman

countrywoman

frontiersman

longshoreman

newspaperman

servicewoman

warehouseman

workingwoman

assemblywoman

bildungsroman

businesswoman

coastguardman

congresswoman

handcraftsman

lowerclassman

supersalesman

underclassman

upperclassman

coastguardsman

committeewoman

handicraftsman

newspaperwoman

sportfisherman

agribusinessman

plainclothesman

Characters can absolutely be in the public domain and hundreds of them are. In most cases, when an original work enters the public domain so do the characters. L. Frank Baum's book "The Wonderful Wizard of Oz" is public domain, and so Dorothy Gale, the Scarecrow, the Tin Woodsman and the Cowardly Lion are in the public domain by extension. There are examples where this is not the case - Captain Marvel's appearance in "Whiz Comics #2" is public domain, but the character is owned by DC Comics - so you should seek your own legal advice if you have a particular character in mind. Another thing to consider is trademark. Trademark is completely separate from copyright. The character of Thor from Norse mythology is 100% public domain, but Marvel Comics has trademark on the name Thor for their comic book super hero, so no one else can create a comic titled "Thor," even though they could use a character named Thor inside their comic. Here is a partial list of comic book characters in the public domain: 13 & Jinx (Lev Gleason)

Airboy (Hillman)

Airmale & Stampy (Prize)

Airman (Centaur)

Amazing Man & Tommy (Centaur)

The American Crusader (Standard/Better/Nedor)

The American Eagle & Eaglet (Standard/Better/Nedor)

The Arrow (Centaur)

Atomic Man (Prize)

The Avenger

Black Owl [1] (Prize)

Black Owl [2] (Prize)

Black Terror & Tim (Standard/Better/Nedor)

Black Venus (Aviation Press)

Blackout (Lev Gleason)

Blue Beetle [Dan Garret I] & Sparky (Fox)

Blue Bolt (Novelty)

Blue Streak (Prize)

Bombshell, Son of War (Lev Gleason)

Boy King & Giant (Hillman)

The Bronze Terror (Lev Gleason)

Captain Battle & Hale Battle (Lev Gleason)

Captain Battle Jr. (Lev Gleason)

Captain Courageous (Ace Magazines)

Captain Flash (Sterling)

Captain Future (Standard/Better/Nedor)

Cat-Man & Kitten (Holyoke)

The Cavalier (Standard/Better/Nedor)

The Chameleon (Novelty)

The Claw (Lev Gleason)

The Clock (Centaur, Quality)

The Clown (Ace Magazines)

The Cobra (Ace Magazines)

Crimebuster (Lev Gleason)

Cyclone (Nita)

Daredevil (Lev Gleason)

The Dart & Ace (Fox)

Doc Strange & Mike (Standard/Better/Nedor)

Dr. Frost (Prize)

Dr. Nemesis (Ace Magazines)

Dynamic Man & Dynamic Boy (Harry 'A' Chesler)

The Eagle & Buddy (Fox)

Emperor Seng I (Prize)

The Face (Columbia)

Fantom of the Fair (Centaur)

Fantomah (Fiction House)

Fearless Flint (Eastern Color)

Fighting Yank (Standard/Better/Nedor)

The Flag (Ace Magazines)

The Flame & Flame Girl (Fox)

Fly-Man (Harvey)

Flying Fist & Bingo (Prize)

The Ghost (Lev Gleason)

The Ghost (Nedor)

Ghost Rider (Magazine Enterprises)

The Great Question (Centaur)

The Great Voodini (Prize)

The Green Dragon (Lev Gleason)

Green Giant (Pelican Press)

Green Lama (Prize, Spark)

Green Mask & Domino (Fox)

Green Sorceress (Novelty)

Grim Reaper (Standard/Better/Nedor)

The Hood (Holyoke)

The Human Meteor [Duke O'Dowd] (Harvey)

Hydroman (Eastern Color)

Iron Jaw (Lev Gleason)

Jupiter, the Master Magician (Prize)

Kangaa (Fiction House)

Lady Satan (Fox)

Lance Lewis, Space Detective (Lev Gleason)

Lancer (Ace Magazines)

Lash Lightning & Lightning Girl (Ace Magazines)

The Liberator (Standard/Better/Nedor)

The Little Wise Guys (Lev Gleason)

The Magnet (Standard/Better/Nedor)

Magno & Davey (Ace Magazines)

Major Victory (Harry 'A' Chesler)

Man o' Metal (Eastern Color)

Man of War (Centaur)

Martan the Marvel Man & Vana (Dell)

Marvelo (Columbia)

Masked Marvel (Centaur)

Merlin [Moe Lynn] (Ace Magazines)

Mighty Man (Centaur)

Miss Masque (Standard/Better/Nedor)

Mister Midnite (Lev Gleason)

Mr. X (Standard Better/Nedor)

Mystico (Standard/Better/Nedor)

Nightro (Lev Gleason)

Octobriana

The Owl (Dell)

Pat Patriot (Lev Gleason)

Phantasmo (Dell)

Power Nelson (Prize)

Prince Ra (Prize)

Princess Pantha (Standard/Better/Nedor)

Professor Supermind & Son (Dell)

Pyroman (Standard/Better/Nedor)

Radior (Dell)

Rainboy Boy (Eastern Color)

The Raven (Ace Periodicals)

The Red Seal (Novelty)

Rocketman & Rocketgirl (Harry 'A' Chesler)

Samson & David (Fox)

The Scarab (Standard/Better/Nedor)

Sergeant Spook (Novelty)

Silver Streak & Meteor (Lev Gleason)

Sky Wizard, Master of Space (Hillman)

The Sky Wolf (Lev Gleason)

Skyman (Columbia)

Spacehawk (Novelty)

Sparkman (United Features)

Spider Queen (Fox)

Spirit Man (Lev Gleason)

Stardust, the Super Wizard (Fox)

Strongman (Holyoke)

Sub Zero Man (Novelty)

The Super-American (Fiction House)

The Sword (Ace Magazines)

The Target & The Targeteers (Novelty)

Thor (Fox)

Thun-Dhor (Lev Gleason)

The Twister (Novelty)

U.S. Jones (Fox)

Unknown Soldier (Ace Magazines)

V-Man (Fox)

Volton (Holyoke)

Vulcan (Ace Magazines)

The White Streak (Novelty)

The Woman in Red (Standard/Better/Nedor)

Wonder Man (Fox)

Wonderman [Brad Spencer] (Nedor)

Yank & Doodle (Prize)

Yellowjacket (Frank Communale)

Young Robin Hood (Lev Gleason)

Zippo (Hillman)

Zongar the Miracle Man (Lev Gleason)

Most are words with an MN ending: autumn, condemn, column, damn, hymn, limn, solemn.
Also, the N in kiln became silent centuries ago, among those who use the word every day.

Also "badminton" (as pronounced bad-mitten in the southern United States)

• ancient
• angelic
• angry
• animated
• annoyed
• annual
• answerable
• antagonistic
• anticipatory
• antiquated
• antique
• antsy
• anxious