abrasion vs grinding

abrasion and grinding both are nouns.

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

As nouns, abrasion and grinding are synonyms defined as:

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

Other synonyms of abrasion include attrition, detrition.

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