acyclic vs phytology

acyclic is not a noun while phytology is a noun.

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

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

acyclic (adjective)	phytology (adjective)
not cyclic; especially having parts arranged in spirals rather than whorls
having an open chain structure