bum vs excrement

bum and excrement both are nouns.

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

bum (noun)	excrement (noun)
the fleshy part of the human body that you sit on	waste matter (as urine or sweat but especially feces) discharged from the body
a vagrant
a person who is deemed to be despicable or contemptible
person who does no work

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

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