birth defect vs defect

birth defect and defect both are nouns.

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

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

Other hypernyms of birth defect include anomalousness, anomaly.

birth defect (noun)	defect (noun)
a defect that is present at 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

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