itch vs urge

itch and urge both are nouns.

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

As nouns, itch and urge are synonyms defined as:

itch (noun)	urge (noun)
an irritating cutaneous sensation that produces a desire to scratch	a strong restless desire
a strong restless desire	an instinctive motive
a contagious skin infection caused by the itch mite; characterized by persistent itching and skin irritation

itch (verb)	urge (verb)
have a strong desire or urge to do something	force or impel in an indicated direction
have or perceive an itch	spur on or encourage especially by cheers and shouts
scrape or rub as if to relieve itching	push for something
cause to perceive an itch