atom vs molecule

atom and molecule both are nouns.

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

As nouns, atom and molecule are synonyms defined as:

Other synonyms of atom include corpuscle, mote, particle, speck.

atom (noun)	molecule (noun)
(physics and chemistry) the smallest component of an element having the chemical properties of the element	(physics and chemistry) the simplest structural unit of an element or compound
(nontechnical usage) a tiny piece of anything	(nontechnical usage) a tiny piece of anything