itch vs itching

itch and itching both are nouns.

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

As nouns, itch and itching are synonyms defined as:

itch and itching: an irritating cutaneous sensation that produces a desire to scratch

Other synonyms of itch include itchiness.

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

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