phytology vs exogamous

phytology is a noun but exogamous is not a noun.

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

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

phytology (adjective)	exogamous (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