sensitiser vs chemical science

sensitiser and chemical science both are nouns.

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

sensitiser (noun)	chemical science (noun)
(chemistry) a substance other than a catalyst that facilitates the start of a catalytic reaction	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions