molecule vs atom

molecule and atom both are nouns.

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

As nouns, molecule and atom are synonyms defined as:

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

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