chemistry vs molecular weight

chemistry and molecular weight both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemistry	Yes	No	No	No
molecular weight	Yes	No	No	No

chemistry (noun)	molecular weight (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	(chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule
the way two individuals relate to each other
the chemical composition and properties of a substance or object