lie-abed vs bum

lie-abed and bum both are nouns.

Word	Noun	Adjective	Verb	Adverb
lie-abed	Yes	No	No	No
bum	Yes	Yes	Yes	No

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

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

lie-abed (noun)	bum (noun)
a person who stays in bed until a relatively late hour	the fleshy part of the human body that you sit on
	a vagrant
	a person who is deemed to be despicable or contemptible
	person who does no work

lie-abed (adjective)	bum (adjective)
	of very poor quality; flimsy

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