snag vs rub

snag and rub both are nouns.

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

As nouns, snag and rub are synonyms defined as:

Other synonyms of snag include hang-up, hitch.

snag (noun)	rub (noun)
an unforeseen obstacle	the act of rubbing or wiping
an opening made forcibly as by pulling apart	an unforeseen obstacle
a dead tree that is still standing, usually in an undisturbed forest
a sharp protuberance

snag (verb)	rub (verb)
catch on a snag	move over something with pressure
hew jaggedly	cause friction
get by acting quickly and smartly	scrape or rub as if to relieve itching