particle vs grinding

particle and grinding both are nouns.

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

As nouns, grinding is a hyponym of particle; that is, grinding is a word with a more specific, narrower meaning than particle:

Other hyponyms of particle include grain, chylomicron, flyspeck, identification particle.

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