acardia vs abnormalcy

acardia and abnormalcy both are nouns.

Word	Noun	Adjective	Verb	Adverb
acardia	Yes	No	No	No
abnormalcy	Yes	No	No	No

As nouns, abnormalcy is a hypernym of acardia; that is, abnormalcy is a word with a broader meaning than acardia:

acardia: congenital absence of the heart (as in the development of some monsters)
abnormalcy: an abnormal physical condition resulting from defective genes or developmental deficiencies

Other hypernyms of acardia include abnormality.

acardia (noun)	abnormalcy (noun)
congenital absence of the heart (as in the development of some monsters)	an abnormal physical condition resulting from defective genes or developmental deficiencies