congenital disorder vs birth defect

congenital disorder and birth defect both are nouns.

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

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

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

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