dissociation vs chemical science

dissociation and chemical science both are nouns.

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

dissociation (noun)	chemical science (noun)
the act of removing from association	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
(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