polydactyly vs hyperdactyly

polydactyly and hyperdactyly both are nouns.

Word	Noun	Adjective	Verb	Adverb
polydactyly	Yes	No	No	No
hyperdactyly	Yes	No	No	No

As nouns, polydactyly and hyperdactyly are synonyms defined as:

polydactyly and hyperdactyly: birth defect characterized by the presence of more than the normal number of fingers or toes

polydactyly (noun)	hyperdactyly (noun)
birth defect characterized by the presence of more than the normal number of fingers or toes	birth defect characterized by the presence of more than the normal number of fingers or toes