gavel

Rhymes with gravel (small stone) : To break gravel, you need a gavel(hammer)

A hammer like tool or gavel turns rock into gravel

sound like travel when u travel u carry a wooden hammer for saftey against thiefs

in an auction a gavel is struck to announce that the item has been sold or given--->gaven--->gavel

gavel=girl(g)+travel = when a girl travel she used to have a hammerlike tool for self protection