fetal distress vs abnormalcy

fetal distress and abnormalcy both are nouns.

Word	Noun	Adjective	Verb	Adverb
fetal distress	Yes	No	No	No
abnormalcy	Yes	No	No	No

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

fetal distress: an abnormal condition of a fetus; usually discovered during pregnancy and characterized by an abnormal heart rhythm
abnormalcy: an abnormal physical condition resulting from defective genes or developmental deficiencies

Other hypernyms of fetal distress include abnormality.

fetal distress (noun)	abnormalcy (noun)
an abnormal condition of a fetus; usually discovered during pregnancy and characterized by an abnormal heart rhythm	an abnormal physical condition resulting from defective genes or developmental deficiencies