lounger vs bum

lounger and bum both are nouns.

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

As nouns, bum is a hypernym of lounger; that is, bum is a word with a broader meaning than lounger:

Other hypernyms of lounger include do-nothing, idler, layabout, loafer.

lounger (noun)	bum (noun)
an armchair whose back can be lowered and foot can be raised to allow the sitter to recline in it	the fleshy part of the human body that you sit on
an article of clothing designed for comfort and leisure wear	a vagrant
someone who wastes time	a person who is deemed to be despicable or contemptible
	person who does no work

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

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