chemical science vs acyclic

chemical science is a noun but acyclic is not a noun.

Word	Noun	Adjective	Verb	Adverb
chemical science	Yes	No	No	No
acyclic	No	Yes	No	No

chemical science (noun)	acyclic (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions

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