According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 134 words with the pattern ----DER. That is, seven letter words with 5th letter D and 6th letter E and 7th letter R. In alphabetical order, they are:
abrader
acceder
acrider
amender
asunder
avoider
awarder
bladder
blander
bleeder
blender
blinder
blonder
blunder
boarder
boulder
bounder
bourder
bowlder
braider
brander
breeder
broader
broider
brooder
builder
caulder
chalder
childer
chowder
chudder
chunder
cladder
clowder
crowder
daunder
decider
decoder
deluder
denuder
derider
divider
dreader
emender
encoder
fetider
fielder
flinder
flooder
foulder
founder
gelider
gladder
glidder
grander
gridder
grinder
guarder
guilder
hoarder
hounder
humider
impeder
insider
invader
joinder
kneader
launder
livider
lounder
lucider
lurider
maunder
meander
moulder
nakeder
parader
pleader
plodder
plunder
poinder
poulder
pounder
prodder
prouder
rabider
rapider
reorder
resider
rigider
rounder
scalder
scolder
scowder
scudder
seceder
shedder
shidder
shudder
skelder
skidder
slander
sledder
slender
slidder
smolder
snodder
solider
sounder
speeder
spelder
spender
spudder
staider
stander
strider
sworder
tepider
thonder
thunder
timider
tireder
treader
unorder
valider
vapider
vivider
vocoder
weirder
whidder
wielder
woolder
wounder
yielder
That's trouble.
Some seven letter words with the configuration "PR--O-N: are:prenoonpronoun
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern ----I-Z. That is, seven letter words with 5th letter I and 7th letter Z. In alphabetical order, they are: kibbitz
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern --A-I-I. That is, seven letter words with 3rd letter A and 5th letter I and 7th letter I. In alphabetical order, they are: clarini gradini
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern ---IAI-. That is, seven letter words with 4th letter I and 5th letter A and 6th letter I. In alphabetical order, they are: antiair
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern --A-AA-. That is, seven letter words with 3rd letter A and 5th letter A and 6th letter A. In alphabetical order, they are: ujamaas
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern I---A-A. That is, seven letter words with 1st letter I and 5th letter A and 7th letter A. In alphabetical order, they are: ikebana intrada
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -AA-I--. That is, seven letter words with 2nd letter A and 3rd letter A and 5th letter I. In alphabetical order, they are: baalism
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern ---IJ--. That is, seven letter words with 4th letter I and 5th letter J. In alphabetical order, they are: antijam harijan
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern ----Z-I. That is, seven letter words with 5th letter Z and 7th letter I. In alphabetical order, they are: jacuzzi palazzi
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern IA--I--. That is, seven letter words with 1st letter I and 2nd letter A and 5th letter I. In alphabetical order, they are: iambics iambist
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern ---IA-I. That is, seven letter words with 4th letter I and 5th letter A and 7th letter I. In alphabetical order, they are: anziani biriani