congenital defect vs birth defect

congenital defect and birth defect both are nouns.

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

As nouns, congenital defect and birth defect are synonyms defined as:

Other synonyms of congenital defect include congenital abnormality, congenital anomaly, congenital disorder.

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