9 letter words:
oncogenic14,
7 letter words:
ionogen8,
6 letter words:
coigne9,
coning9,
cooing9,
conine8,
neocon8,
gonion7,
goonie7,
nonego7,
noogie7,
ionone6,
5 letter words:
conic9,
cogon8,
coign8,
conge8,
congo8,
genic8,
incog8,
conin7,
nonce7,
onion5,
4 letter words:
coco8,
cine6,
cion6,
coin6,
cone6,
coni6,
conn6,
coon6,
icon6,
nice6,
once6,
gien5,
gone5,
goon5,
neon4,
nine4,
none4,
noon4,
3 letter words:
cig6,
cog6,
con5,
coo5,
ice5,
ego4,
eng4,
gen4,
gie4,
gin4,
goo4,
neg4,
nog4,
eon3,
inn3,
ion3,
noo3,
one3,
ono3,
2 letter words:
go3,
en2,
in2,
ne2,
no2,
oe2,
oi2,
on2,
