grit

Noun

• fortitude and determination
  • he didn't have the guts to try it
    

• a hard coarse-grained siliceous sandstone

Verb

• clench together
  • grit one's teeth
    

• cover with a grit
  • grit roads
    

Related words

• Synonyms: 
  backbone , guts , moxie , sand , gumption , gritrock , gritstone