paired vs phytology

paired is not a noun while phytology is a noun.

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

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

paired (adjective)	phytology (adjective)
of leaves etc; growing in pairs on either side of a stem
occurring in pairs or as a pair
matched for breeding