chemistry vs law of constant proportion

chemistry and law of constant proportion both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemistry	Yes	No	No	No
law of constant proportion	Yes	No	No	No

chemistry (noun)	law of constant proportion (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 every pure substance always contains the same elements combined in the same proportions by weight
the way two individuals relate to each other
the chemical composition and properties of a substance or object