rub vs itch

rub and itch both are nouns.

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

As verbs, rub and itch are synonyms defined as:

Other synonyms of rub include scratch.

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

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