Originally Posted by Iride01

All sorts of other names for it if one thinks butt is offensive. More properly it's buttocks.

cheeks
seat
bum
tail
rump
butt
posterior
backside
rear
buns
derriere
fanny
bottom
haunches
behind
booty
tush
derrière
hams
caboose
nates
breech
fundament
tail end
rear end
beam
heinie
duff
keister
bootie
can
keester
stern
hunkers
moon

https://www.merriam-webster.com/thesaurus/buttocks