relative molecular mass vs chemical science

relative molecular mass and chemical science both are nouns.

Word	Noun	Adjective	Verb	Adverb
relative molecular mass	Yes	No	No	No
chemical science	Yes	No	No	No

relative molecular mass (noun)	chemical science (noun)
(chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions