monad vs chemical science

monad and chemical science both are nouns.

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

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