sand vs grit

sand and grit both are nouns.

Word	Noun	Adjective	Verb	Adverb
sand	Yes	No	Yes	No
grit	Yes	No	Yes	No

As nouns, sand and grit are synonyms defined as:

Other synonyms of sand include backbone, gumption, guts, moxie.

sand (noun)	grit (noun)
fortitude and determination	fortitude and determination
a loose material consisting of grains of rock or coral	a hard coarse-grained siliceous sandstone

sand (verb)	grit (verb)
rub with sandpaper	clench together
	cover with a grit