Synonyms for butt

Most common

1. Ass

2. Cigarette

cigarette, fag, smoke, coffin nail slang

3. Laughing stock

laughing stock, goat, stooge

4. Heel — the waste end of anything. A crust end-piece of a loaf of bread

Other

target, stub, barrel, nut, pipe, stump, mark, object, cask

n. 1
The waste end of anything. A crust end-piece of a loaf of bread.
n. 2
The larger or thicker end of something; the blunt end, in distinction from the sharp or narrow end. The buttocks or anus (used as a minced oath in idiomatic expressions; less objectionable than arse/ass).
Get up off your butt and get to work.
n. 3
The larger or thicker end of something; the blunt end, in distinction from the sharp or narrow end. The buttocks or anus (used as a minced oath in idiomatic expressions; less objectionable than arse/ass). The whole buttocks and pelvic region that includes one's private parts.
n. 4
The larger or thicker end of something; the blunt end, in distinction from the sharp or narrow end. The buttocks or anus (used as a minced oath in idiomatic expressions; less objectionable than arse/ass). Body; self.
Get your butt to the car.

Word family: buttass butt-clenching buttcrack buttface buttfuck buttful butthead butthole
Phrases: butt in bust one's butt butt cheek butt monkey butt call butt crack kick butt butt dial

Use in printed books, per decade from 1850 to 2019.

3 letters: can¹, ass¹, nut¹, bum¹, fag¹
4 letters: mark¹, seat¹, rear¹, tail¹, boot¹, pipe¹, goat¹, heel¹, buns¹, stub¹, rump¹, cask¹, tush¹
5 letters: smoke¹, stern¹, pratt¹, fanny², stump¹, butty, nates
6 letters: behind², bottom², target², object², barrel², stooge¹
7 letters: tooshie
8 letters: derriere
9 letters: cigarette³, posterior³, fundament

The small number after each word is its number of syllables (fanny² = 2 syllables).