atom vs monad

atom and monad both are nouns.

Word	Noun	Adjective	Verb	Adverb
atom	Yes	No	No	No
monad	Yes	No	No	No

As nouns, monad is a hyponym of atom; that is, monad is a word with a more specific, narrower meaning than atom:

atom: (physics and chemistry) the smallest component of an element having the chemical properties of the element
monad: (chemistry) an atom having a valence of one

Other hyponyms of atom include isotope, carbon atom, hydrogen atom, free radical, radical.

atom (noun)	monad (noun)
(physics and chemistry) the smallest component of an element having the chemical properties of the element	(biology) a single-celled microorganism (especially a flagellate protozoan)
(nontechnical usage) a tiny piece of anything	a singular metaphysical entity from which material properties are said to derive
	(chemistry) an atom having a valence of one