chemistry vs law of multiple proportions

chemistry and law of multiple proportions both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemistry	Yes	No	No	No
law of multiple proportions	Yes	No	No	No

chemistry (noun)	law of multiple proportions (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	(chemistry) law stating that when two elements can combine to form more than one compound the amounts of one of them that combines with a fixed amount of the other will exhibit a simple multiple relation
the way two individuals relate to each other
the chemical composition and properties of a substance or object