grinding vs abrasion

grinding and abrasion both are nouns.

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

As nouns, grinding and abrasion are synonyms defined as:

grinding and abrasion: the wearing down of rock particles by friction due to water or wind or ice

Other synonyms of grinding include attrition, detrition.

grinding (noun)	abrasion (noun)
a harsh and strident sound (as of the grinding of gears)	the wearing down of rock particles by friction due to water or wind or ice
material resulting from the process of grinding	erosion by friction
the wearing down of rock particles by friction due to water or wind or ice	an abraded area where the skin is torn or worn off