pass over vs rub

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

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

As verbs, rub is a hypernym of pass over; that is, rub is a word with a broader meaning than pass over:

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

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