fundament

How to sign: the fleshy part of the human body that you sit on
"he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing?";

Similiar / Same: rear end, ass, fanny, derriere, behind, tush, tooshie, buttocks, prat, posterior, keister, hind end, hindquarters, buns, arse, nates, seat, backside, rump, stern, tail end, bottom, butt, rear, tail, bum

Categories: body part

fundament

How to sign: the fundamental assumptions from which something is begun or developed or calculated or explained
"the whole argument rested on a basis of conjecture";

Similiar / Same: groundwork, cornerstone, basis, foundation, base

Categories: assumption, supposal, supposition

Within this category: meat and potatoes

fundament

How to sign: lowest support of a structure
"it was built on a base of solid rock"; "he stood at the foot of the tower";

Similiar / Same: understructure, groundwork, substructure, base, foundation, foot

Categories: support

Within this category: bed, raft foundation