brachydactyly vs brachydactylia

brachydactyly and brachydactylia both are nouns.

Word	Noun	Adjective	Verb	Adverb
brachydactyly	Yes	No	No	No
brachydactylia	Yes	No	No	No

As nouns, brachydactyly and brachydactylia are synonyms defined as:

brachydactyly and brachydactylia: abnormal shortness of fingers and toes

brachydactyly (noun)	brachydactylia (noun)
abnormal shortness of fingers and toes	abnormal shortness of fingers and toes