relative atomic mass vs chemical science

relative atomic mass and chemical science both are nouns.

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

relative atomic mass (noun)	chemical science (noun)
(chemistry) the mass of an atom of a chemical element expressed in atomic mass units	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions