speck vs grinding

speck and grinding both are nouns.

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

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

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

speck (noun)	grinding (noun)
a very small spot	a harsh and strident sound (as of the grinding of gears)
a slight but appreciable amount	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

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