Nouns

(n)grit, gritrock, gritstonea hard coarse-grained siliceous sandstone
(n)backbone, grit, guts, moxie, sand, gumptionfortitude and determination“he didn't have the guts to try it”

Verbs

(v)gritcover with a grit“grit roads”
(v)gritclench together“grit one's teeth”