bum vs idler

bum and idler both are nouns.

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

As nouns, bum and idler are synonyms defined as:

Other synonyms of bum include do-nothing, layabout, loafer.

bum (noun)	idler (noun)
the fleshy part of the human body that you sit on	person who does no work
a vagrant
a person who is deemed to be despicable or contemptible
person who does no work

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

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