but
gut
hut
jut
nut
rut
shut
cub
hub
nub
rub
sub
tub
grub
bug
dug
hug
lug
mug
pug
rug
tug
bum
gum
hum
mum
sum
bun
fun
gun
nun
pun
run
bud
dud
mud
pup
bus
hush