atresia vs abnormalcy

atresia and abnormalcy both are nouns.

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

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

atresia: an abnormal condition in which a normal opening or tube in the body (as the urethra) is closed or absent
abnormalcy: an abnormal physical condition resulting from defective genes or developmental deficiencies

Other hypernyms of atresia include abnormality.

atresia (noun)	abnormalcy (noun)
an abnormal condition in which a normal opening or tube in the body (as the urethra) is closed or absent	an abnormal physical condition resulting from defective genes or developmental deficiencies