meromelia vs congenital defect

meromelia and congenital defect both are nouns.

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

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

Other hypernyms of meromelia include birth defect, congenital abnormality, congenital anomaly, congenital disorder.

meromelia (noun)	congenital defect (noun)
congenital absence of part of an arm or leg	a defect that is present at birth