protrusion vs snag

protrusion and snag both are nouns.

Word	Noun	Adjective	Verb	Adverb
protrusion	Yes	No	No	No
snag	Yes	No	Yes	No

As nouns, snag is a hyponym of protrusion; that is, snag is a word with a more specific, narrower meaning than protrusion:

protrusion: something that bulges out or is protuberant or projects from its surroundings
snag: a sharp protuberance

Other hyponyms of protrusion include frontal eminence, occipital protuberance, belly, caput, mogul, nub, nubble, wart.

protrusion (noun)	snag (noun)
the act of projecting out from something	an unforeseen obstacle
something that bulges out or is protuberant or projects from its surroundings	an opening made forcibly as by pulling apart
	a dead tree that is still standing, usually in an undisturbed forest
	a sharp protuberance

protrusion (verb)	snag (verb)
	catch on a snag
	hew jaggedly
	get by acting quickly and smartly