displacement reaction vs chemical science

displacement reaction and chemical science both are nouns.

Word	Noun	Adjective	Verb	Adverb
displacement reaction	Yes	No	No	No
chemical science	Yes	No	No	No

displacement reaction (noun)	chemical science (noun)
(chemistry) a reaction in which an elementary substance displaces and sets free a constituent element from a compound	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions