nevus vs defect

nevus and defect both are nouns.

Word	Noun	Adjective	Verb	Adverb
nevus	Yes	No	No	No
defect	Yes	No	Yes	No

As nouns, defect is a hypernym of nevus; that is, defect is a word with a broader meaning than nevus:

nevus: a blemish on the skin that is formed before birth
defect: a mark or flaw that spoils the appearance of something (especially on a person's body)

Other hypernyms of nevus include blemish, mar.

nevus (noun)	defect (noun)
a blemish on the skin that is formed before birth	a mark or flaw that spoils the appearance of something (especially on a person's body)
	a failing or deficiency
	an imperfection in an object or machine
	an imperfection in a bodily system

nevus (verb)	defect (verb)
	desert (a cause, a country or an army), often in order to join the opposing cause, country, or army