itch vs rub

itch and rub both are nouns.

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

As verbs, itch and rub are synonyms defined as:

Other synonyms of itch include scratch.

itch (noun)	rub (noun)
an irritating cutaneous sensation that produces a desire to scratch	the act of rubbing or wiping
a strong restless desire	an unforeseen obstacle
a contagious skin infection caused by the itch mite; characterized by persistent itching and skin irritation

itch (verb)	rub (verb)
have a strong desire or urge to do something	move over something with pressure
have or perceive an itch	cause friction
scrape or rub as if to relieve itching	scrape or rub as if to relieve itching
cause to perceive an itch