lesion vs scratch

lesion and scratch both are nouns.

Word	Noun	Adjective	Verb	Adverb
lesion	Yes	No	No	No
scratch	Yes	No	Yes	No

As nouns, scratch is a hyponym of lesion; that is, scratch is a word with a more specific, narrower meaning than lesion:

lesion: an injury to living tissue (especially an injury involving a cut or break in the skin)
scratch: an abraded area where the skin is torn or worn off

Other hyponyms of lesion include raw wound, stigmata, abrasion, excoriation, scrape, cut, gash, slash, slice, laceration, bite.

lesion (noun)	scratch (noun)
any localized abnormal structural change in a bodily part	an indication of damage
an injury to living tissue (especially an injury involving a cut or break in the skin)	(golf) a handicap of zero strokes
	poor handwriting
	a harsh noise made by scraping
	dry mash for poultry
	a line indicating the location of the start of a race or a game
	a competitor who has withdrawn from competition
	informal terms for money
	a depression scratched or carved into a surface
	an abraded area where the skin is torn or worn off

lesion (verb)	scratch (verb)
	cut the surface of; wear away the surface of
	cause friction
	carve, cut, or etch into a material or surface
	gather (money or other resources) together over time
	remove by erasing or crossing out or as if by drawing a line
	scrape or rub as if to relieve itching
	postpone indefinitely or annul something that was scheduled