atom vs particle

atom and particle both are nouns.

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

As nouns, atom and particle are synonyms defined as:

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

atom (noun)	particle (noun)
(physics and chemistry) the smallest component of an element having the chemical properties of the element	a function word that can be used in English to form phrasal verbs
(nontechnical usage) a tiny piece of anything	a body having finite mass and internal structure but negligible dimensions
	(nontechnical usage) a tiny piece of anything