rub vs pass over

rub is a noun but pass over is not a noun.

Word	Noun	Adjective	Verb	Adverb
rub	Yes	No	Yes	No
pass over	No	No	Yes	No

As verbs, pass over is a hyponym of rub; that is, pass over is a word with a more specific, narrower meaning than rub:

rub (noun)	pass over (noun)
the act of rubbing or wiping
an unforeseen obstacle

rub (verb)	pass over (verb)
move over something with pressure	bypass
cause friction	rub with a circular motion
scrape or rub as if to relieve itching	travel across or pass over
	make a passage or journey from one place to another
	fly over