law of reciprocal proportions vs chemistry

law of reciprocal proportions and chemistry both are nouns.

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

law of reciprocal proportions (noun)	chemistry (noun)
(chemistry) law stating that the proportions in which two elements separately combine with a third element are also the proportions in which they combine together	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