phytology vs endogamous

phytology is a noun but endogamous is not a noun.

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

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

phytology (adjective)	endogamous (adjective)
	pertaining to or characterized by the custom of marrying only within the limits of a clan or tribe
	characterized by or fit for fertilization by pollen from another flower of the same kind