particle vs atom

particle and atom both are nouns.

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

As nouns, particle and atom are synonyms defined as:

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

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