chemical science vs monad

chemical science and monad both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemical science	Yes	No	No	No
monad	Yes	No	No	No

chemical science (noun)	monad (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	(biology) a single-celled microorganism (especially a flagellate protozoan)
	a singular metaphysical entity from which material properties are said to derive
	(chemistry) an atom having a valence of one