microbrachia vs abnormalcy

microbrachia and abnormalcy both are nouns.

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

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

microbrachia: abnormally small arms
abnormalcy: an abnormal physical condition resulting from defective genes or developmental deficiencies

Other hypernyms of microbrachia include abnormality.

microbrachia (noun)	abnormalcy (noun)
abnormally small arms	an abnormal physical condition resulting from defective genes or developmental deficiencies