brachydactylia vs brachydactyly

brachydactylia and brachydactyly both are nouns.

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

As nouns, brachydactylia and brachydactyly are synonyms defined as:

brachydactylia and brachydactyly: abnormal shortness of fingers and toes

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