bum vs fundament

bum and fundament both are nouns.

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

As nouns, bum and fundament are synonyms defined as:

bum (noun)	fundament (noun)
the fleshy part of the human body that you sit on	lowest support of a structure
a vagrant	the fleshy part of the human body that you sit on
a person who is deemed to be despicable or contemptible	the fundamental assumptions from which something is begun or developed or calculated or explained
person who does no work

bum (adjective)	fundament (adjective)
of very poor quality; flimsy

bum (verb)	fundament (verb)
ask for and get free; be a parasite
be lazy or idle