Fanny
Seat
arse
ass
backside
behind
bottom
bum
butt
buttocks
can
derriere
fundament
hind end
hindquarters
keister
posterior
prat
rear
rear end
rump
stern
tail
tail end
tooshie
tush
body part
Duns
Frunze
duns
funs
guns
muns
nuns
ones
outruns
puns
reruns
runs
shuns
sons
stuns
suns
tonnes
tons