contact vs rub

contact and rub both are nouns.

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

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

Other hyponyms of contact include wipe, fair ball, snick, laying on.

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

contact (noun)	rub (noun)
the act of touching physically	the act of rubbing or wiping
close interaction	an unforeseen obstacle
(electronics) a junction where things (as two electrical conductors) touch or are in physical contact
a thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication
a channel for communication between groups
a communicative interaction
the physical coming together of two or more things
a person who is in a position to give you special assistance
the state or condition of touching or of being in immediate proximity

contact (verb)	rub (verb)
be in or establish communication with	move over something with pressure
be in direct physical contact with; make contact	cause friction
	scrape or rub as if to relieve itching