unsubdivided vs phytology

unsubdivided is not a noun while phytology is a noun.

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

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

unsubdivided (adjective)	phytology (adjective)
(botany) of leaf shapes; of leaves having no divisions or subdivisions