rubbing vs abrasion

rubbing and abrasion both are nouns.

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

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

rubbing: the resistance encountered when one body is moved in contact with another
abrasion: the wearing down of rock particles by friction due to water or wind or ice

Other hyponyms of rubbing include attrition, detrition, grinding, adhesive friction, grip, traction.

rubbing (noun)	abrasion (noun)
effort expended in moving one object over another with pressure	the wearing down of rock particles by friction due to water or wind or ice
representation consisting of a copy (as of an engraving) made by laying paper over something and rubbing it with charcoal	erosion by friction
the resistance encountered when one body is moved in contact with another	an abraded area where the skin is torn or worn off