According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern -IL-OA. That is, six letter words with 2nd letter I and 3rd letter L and 5th letter O and 6th letter A. In alphabetical order, they are:

bilboa

hilloa

ha, hila, hora, hoya, hula, hyla, henna, herma, holla, honda, hooka, hosta, huzza, hydra, hyena, hypha, hegira, hejira, hernia, hilloa, holloa, hoopla, hulloa, hutzpa, hydria, helluva, hemiola, hymenia, hypogea, hyponea, hypoxia, hemiolia, hospitia, hyphemia, hyponoia, hypopnea, hysteria,

And some bonus words...

hemelytra, hybridoma, hyperbola, hyperemia, hyperopia, hyperpnea, hypotonia, hypoxemia, hebephrenia, hydromedusa, hydrophobia, hydroxyurea, hymenoptera, hypermnesia, hypothermia, hyperkinesia, hyperlipemia, hyperpyrexia, hyperthermia, hypochondria, hypoglycemia, hyperesthesia, hyperglycemia, hypermetropia, hyperuricemia, hemoglobinuria, hyperlipidemia, hypercholesterolemia

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 104 words with the pattern --L-O-. That is, six letter words with 3rd letter L and 5th letter O. In alphabetical order, they are:

abloom

agloos

allyou

balboa

ballon

ballot

ballow

baloos

bellow

bilboa

bilbos

billon

billow

bollox

bolson

callop

callow

cellos

collop

dallop

dalton

dildoe

dildos

dollop

falcon

fallow

felloe

fellow

filfot

fillos

folios

follow

fulgor

fylfot

galiot

gallon

gallop

gallow

galoot

galvos

gollop

halloa

halloo

hallos

hallot

hallow

helios

hellos

hilloa

hillos

holloa

holloo

hollos

hollow

hulloa

hulloo

hullos

igloos

jellos

jollop

kelson

kolhoz

kolkoz

lollop

mallow

maltol

mellow

melton

milkos

nelson

pallor

pilaos

pillow

polios

polyol

pulaos

pulton

relook

sallow

salmon

saloon

saloop

saltos

salvor

salvos

seldom

solion

talbot

talion

tallol

tallot

tallow

telcos

telson

toluol

uplook

vellon

volvox

waldos

wallop

wallow

weldor

willow

yellow

abode, abohm, aboil, aboma, aboon, abort, about, above, acock, acold, acorn, adobe, adobo, adopt, adore, adorn, adown, adoze, aeons, afoot, afore, afoul, agone, agons, agony, agora, ahold, aioli, aloes, aloft, aloha, aloin, alone, along, aloof, aloud, amoks, amole, among, amort, amour, anoas, anode, anole, anomy, apods, aport, aroid, aroma, arose, atoll, atoms, atomy, atone, atony, atopy, avoid, avows, awoke, awols, axone, axons, azoic, azole, azons, azote, azoth

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 130 words with the pattern ---LO-. That is, six letter words with 4th letter L and 5th letter O. In alphabetical order, they are:

accloy

analog

anglos

apolog

bailor

ballon

ballot

ballow

barlow

beclog

bellow

billon

billow

bollox

brulot

callop

callow

carlot

cellos

chalot

cholos

coelom

collop

coplot

cyclos

dallop

deploy

dialog

diglot

diploe

diplon

doblon

dollop

drylot

duolog

employ

epilog

etalon

fallow

felloe

fellow

fillos

firlot

follow

gallon

gallop

gallow

giglot

gollop

halloa

halloo

hallos

hallot

hallow

harlot

hellos

hilloa

hillos

holloa

holloo

hollos

hollow

hulloa

hulloo

hullos

inflow

isolog

jailor

jellos

jollop

loglog

lollop

mallow

matlos

matlow

mellow

merlon

merlot

moblog

mooloo

muflon

myelon

ocelot

onflow

ovolos

pallor

parlor

peplos

phylon

pillow

prolog

putlog

realos

reflow

reglow

replot

replow

sailor

sallow

samlor

sawlog

shalom

shalot

sholom

sialon

sigloi

siglos

slalom

stolon

stylos

sublot

tailor

tallol

tallot

tallow

teflon

tholoi

tholos

tiglon

unclog

upblow

upflow

vellon

wallop

wallow

weblog

whilom

willow

yellow

zealot