polydactylous vs biology

polydactylous is not a noun while biology is a noun.

Word	Noun	Adjective	Verb	Adverb
polydactylous	No	Yes	No	No
biology	Yes	No	No	No

polydactylous (noun)	biology (noun)
	the science that studies living organisms
	all the plant and animal life of a particular region
	characteristic life processes and phenomena of living organisms

polydactylous (adjective)	biology (adjective)
of or relating to a person (or other vertebrate) having more than the normal number of digits