What's wrong with having two words for such a lovely, savory thing? Anyway, crostino seems to be the standard Tuscan Italian word for canapé or hors d'œuvre. (It's related to our crust.) The word and the tidbit, bruschetta, hails from Abbruzzo in the South. In standard Italian it's pronounced /bruskEtta/, though in some dialects it is pronounced with a hushing rather than a hissing s, e.g., /bruSEtta/.