law of constant proportion vs chemistry

law of constant proportion and chemistry both are nouns.

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

law of constant proportion (noun)	chemistry (noun)
(chemistry) law stating that every pure substance always contains the same elements combined in the same proportions by weight	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
	the way two individuals relate to each other
	the chemical composition and properties of a substance or object