molecule vs particle

molecule and particle both are nouns.

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

As nouns, molecule and particle are synonyms defined as:

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

molecule (noun)	particle (noun)
(physics and chemistry) the simplest structural unit of an element or compound	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