grinding vs mote

grinding and mote both are nouns.

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

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

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

grinding (noun)	mote (noun)
a harsh and strident sound (as of the grinding of gears)	(nontechnical usage) a tiny piece of anything
material resulting from the process of grinding
the wearing down of rock particles by friction due to water or wind or ice