rub vs grind

rub and grind both are nouns.

Word	Noun	Adjective	Verb	Adverb
rub	Yes	No	Yes	No
grind	Yes	No	Yes	No

rub (noun)	grind (noun)
the act of rubbing or wiping	the act of grinding to a powder or dust
an unforeseen obstacle	hard monotonous routine work
	the grade of particle fineness to which a substance is ground
	an insignificant student who is ridiculed as being affected or boringly studious

rub (verb)	grind (verb)
move over something with pressure	reduce to small pieces or particles by pounding or abrading
cause friction	make a grating or grinding sound by rubbing together
scrape or rub as if to relieve itching	press or grind with a crushing noise
	shape or form by grinding
	created by grinding
	dance by rotating the pelvis in an erotically suggestive way, often while in contact with one's partner such that the dancers' legs are interlaced
	work hard