birth defect vs congenital abnormality

birth defect and congenital abnormality both are nouns.

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

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

birth defect and congenital abnormality: a defect that is present at birth

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

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