law of definite proportions vs chemical science

law of definite proportions and chemical science both are nouns.

Word	Noun	Adjective	Verb	Adverb
law of definite proportions	Yes	No	No	No
chemical science	Yes	No	No	No

law of definite proportions (noun)	chemical science (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