5 letter words:
bongo8,
boong8,
4 letter words:
bong7,
bung7,
gobo7,
boon6,
boun6,
goon5,
3 letter words:
bog6,
bug6,
gob6,
gub6,
bon5,
boo5,
bun5,
nob5,
nub5,
obo5,
gnu4,
gon4,
goo4,
gun4,
nog4,
noo3,
ono3,
oon3,
2 letter words:
bo4,
ob4,
go3,
gu3,
ug3,
no2,
nu2,
on2,
oo2,
ou2,
un2,