5 letter words:
bison7,
boons7,
boson7,
4 letter words:
bins6,
bios6,
bois6,
boon6,
boos6,
nibs6,
nobs6,
obis6,
obos6,
snib6,
snob6,
ions4,
onos4,
oons4,
soon4,
3 letter words:
bin5,
bio5,
bis5,
boi5,
bon5,
boo5,
bos5,
nib5,
nob5,
obi5,
obo5,
obs5,
sib5,
sob5,
ins3,
ion3,
ios3,
iso3,
nis3,
noo3,
nos3,
ono3,
ons3,
oon3,
oos3,
sin3,
son3,
2 letter words:
bi4,
bo4,
ob4,
in2,
io2,
is2,
no2,
oi2,
on2,
oo2,
os2,
si2,
so2,