chemical science vs dissociation

chemical science and dissociation both are nouns.

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

chemical science (noun)	dissociation (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	the act of removing from association
	(chemistry) the temporary or reversible process in which a molecule or ion is broken down into smaller molecules or ions
	a state in which some integrated part of a person's life becomes separated from the rest of the personality and functions independently