chemistry vs periodic law

chemistry and periodic law both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemistry	Yes	No	No	No
periodic law	Yes	No	No	No

chemistry (noun)	periodic law (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	(chemistry) the principle that chemical properties of the elements are periodic functions of their atomic numbers
the way two individuals relate to each other
the chemical composition and properties of a substance or object