grinding vs particle

grinding and particle both are nouns.

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

As nouns, particle is a hypernym of grinding; that is, particle is a word with a broader meaning than grinding:

Other hypernyms of grinding include atom, corpuscle, molecule, mote, speck.

grinding (noun)	particle (noun)
a harsh and strident sound (as of the grinding of gears)	a function word that can be used in English to form phrasal verbs
material resulting from the process of grinding	a body having finite mass and internal structure but negligible dimensions
the wearing down of rock particles by friction due to water or wind or ice	(nontechnical usage) a tiny piece of anything