gash vs lesion

gash and lesion both are nouns.

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

As nouns, lesion is a hypernym of gash; that is, lesion is a word with a broader meaning than gash:

gash: a wound made by cutting
lesion: an injury to living tissue (especially an injury involving a cut or break in the skin)

Other hypernyms of gash include wound.

gash (noun)	lesion (noun)
a strong sweeping cut made with a sharp instrument	any localized abnormal structural change in a bodily part
a trench resembling a furrow that was made by erosion or excavation	an injury to living tissue (especially an injury involving a cut or break in the skin)
a wound made by cutting

gash (verb)	lesion (verb)
cut open