grinding vs speck

grinding and speck both are nouns.

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

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

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

grinding (noun)	speck (noun)
a harsh and strident sound (as of the grinding of gears)	a very small spot
material resulting from the process of grinding	a slight but appreciable amount
the wearing down of rock particles by friction due to water or wind or ice	(nontechnical usage) a tiny piece of anything

grinding (verb)	speck (verb)
	produce specks in or on