fundament vs rump

fundament and rump both are nouns.

Word	Noun	Adjective	Verb	Adverb
fundament	Yes	No	No	No
rump	Yes	No	No	No

As nouns, fundament and rump are synonyms defined as:

fundament (noun)	rump (noun)
lowest support of a structure	the part of an animal that corresponds to the human buttocks
the fleshy part of the human body that you sit on	the fleshy part of the human body that you sit on
the fundamental assumptions from which something is begun or developed or calculated or explained	fleshy hindquarters; behind the loin and above the round