5 letter words:
burns7,
4 letter words:
brus6,
buns6,
burn6,
burs6,
nubs6,
rubs6,
snub6,
urbs6,
nurs4,
runs4,
urns4,
3 letter words:
bru5,
bun5,
bur5,
bus5,
nub5,
rub5,
sub5,
urb5,
nur3,
nus3,
run3,
sun3,
sur3,
uns3,
urn3,
2 letter words:
nu2,
un2,
ur2,
us2,