Noun

• S: (n) grit, gritrock, gritstone (a hard coarse-grained siliceous sandstone)
• S: (n) backbone, grit, guts, moxie, sand, gumption (fortitude and determination) "he didn't have the guts to try it"

Verb

• S: (v) grit (cover with a grit) "grit roads"
• S: (v) grit (clench together) "grit one's teeth"