lesion vs laceration

lesion and laceration both are nouns.

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

As nouns, laceration is a hyponym of lesion; that is, laceration 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)
laceration: a torn ragged wound

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

lesion (noun)	laceration (noun)
any localized abnormal structural change in a bodily part	the act of lacerating
an injury to living tissue (especially an injury involving a cut or break in the skin)	a torn ragged wound