5 letter words:
boron7,
bourn7,
buroo7,
4 letter words:
bozo15,
zobo15,
zobu15,
orzo13,
ouzo13,
zoon13,
boon6,
boor6,
born6,
boun6,
broo6,
burn6,
ourn4,
roon4,
3 letter words:
zoo12,
bon5,
boo5,
bor5,
bro5,
bru5,
bun5,
bur5,
nob5,
nub5,
obo5,
orb5,
rob5,
rub5,
urb5,
noo3,
nor3,
nur3,
ono3,
oon3,
oor3,
our3,
roo3,
run3,
urn3,
2 letter words:
zo11,
bo4,
ob4,
no2,
nu2,
on2,
oo2,
or2,
ou2,
un2,
ur2,