5 letter words:
bonus7,
bosun7,
bouns7,
4 letter words:
boun6,
buns6,
nobs6,
nubs6,
snob6,
snub6,
nous4,
onus4,
3 letter words:
bon5,
bos5,
bun5,
bus5,
nob5,
nub5,
obs5,
sob5,
sub5,
nos3,
nus3,
ons3,
ous3,
son3,
sou3,
sun3,
uns3,
2 letter words:
bo4,
ob4,
no2,
nu2,
on2,
os2,
ou2,
so2,
un2,
us2,