cyclic vs phytology

cyclic is not a noun while phytology is a noun.

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

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

cyclic (adjective)	phytology (adjective)
recurring in cycles
of a compound having atoms arranged in a ring structure
forming a whorl or having parts arranged in a whorl
conforming to the Carnot cycle
marked by repeated cycles