grind vs grinding

grind and grinding both are nouns.

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

grind (noun)	grinding (noun)
the act of grinding to a powder or dust	a harsh and strident sound (as of the grinding of gears)
hard monotonous routine work	material resulting from the process of grinding
the grade of particle fineness to which a substance is ground	the wearing down of rock particles by friction due to water or wind or ice
an insignificant student who is ridiculed as being affected or boringly studious

grind (verb)	grinding (verb)
reduce to small pieces or particles by pounding or abrading
make a grating or grinding sound by rubbing together
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