birth defect vs congenital defect

birth defect and congenital defect both are nouns.

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

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

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

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