For the food:
* Grilled bread: This is the most literal replacement.
* Buttered bread: Implies it's been buttered as well.
* Crisp bread: Emphasizes the texture.
* Seared bread: For a more formal or culinary setting.
* Breadsticks: If it's a thin, long slice of bread.
For the celebratory expression:
* Cheers: This is a common alternative.
* Salud: Spanish for "health."
* Skål: Scandinavian for "cheers."
* Prost: German for "cheers."
* A toast: Simply using the phrase itself.
For the act of browning food:
* Brown: A general term for the action.
* Scorch: For a more intense browning.
* Sear: Used for browning the surface of meat.
* Caramelize: For browning sugar.
For a specific type of toast:
* French toast: A dish made with dipped and fried bread.
* Melba toast: Thin, dry toast used as a snack.
* Croutons: Small, toasted cubes of bread used in salads.
To give you the best alternative, I need more context! Please tell me how you are using the word "toast."