clock watcher vs bum

clock watcher and bum both are nouns.

Word	Noun	Adjective	Verb	Adverb
clock watcher	Yes	No	No	No
bum	Yes	Yes	Yes	No

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

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

clock watcher (noun)	bum (noun)
a worker preoccupied with the arrival of quitting time	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

clock watcher (adjective)	bum (adjective)
	of very poor quality; flimsy

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