chemical science vs dissociate

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

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

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

chemical science (verb)	dissociate (verb)
	to undergo a reversible or temporary breakdown of a molecule into simpler molecules or atoms
	regard as unconnected
	part; cease or break association with