exogamous vs phytology

exogamous is not a noun while phytology is a noun.

Word	Noun	Adjective	Verb	Adverb
exogamous	No	Yes	No	No
phytology	Yes	No	No	No

exogamous (noun)	phytology (noun)
	the branch of biology that studies plants

exogamous (adjective)	phytology (adjective)
pertaining to or characterized by the custom of marrying only outside the limits of a clan or tribe
characterized by or fit for fertilization by a flower that is not closely related