chemistry vs long chain

chemistry and long chain both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemistry	Yes	No	No	No
long chain	Yes	No	No	No

chemistry (noun)	long chain (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	(chemistry) a relatively long chain of atoms in a molecule
the way two individuals relate to each other
the chemical composition and properties of a substance or object