Synonyms For "Fundament" :
1 syllable:
arse, ass, base, bum, buns, butt, can, foot, prat, rear, rump, seat, stern, tail, tooshie, tush
2 syllables:
backside, basis, behind, bottom, buttocks, fanny, groundwork, hind end, nates, rear end, tail end
3 syllables:
cornerstone, derriere, foundation, hindquarters, keister, substructure