phytology vs autophytic

phytology is a noun but autophytic is not a noun.

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

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

phytology (adjective)	autophytic (adjective)
	of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis