skin sensation vs itch

skin sensation and itch both are nouns.

Word	Noun	Adjective	Verb	Adverb
skin sensation	Yes	No	No	No
itch	Yes	No	Yes	No

As nouns, itch is a hyponym of skin sensation; that is, itch is a word with a more specific, narrower meaning than skin sensation:

Other hyponyms of skin sensation include tickle, itchiness, itching, topognosia, topognosis, urtication.

skin sensation (noun)	itch (noun)
a sensation localized on the skin	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

skin sensation (verb)	itch (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