What is a suffix for burnt?

There isn't a common suffix specifically for "burnt." However, you can use different suffixes depending on the context and desired meaning:

* -ed: This is the most common suffix for past participles, and it indicates that something has been burnt: burnt/burned

* -ing: This suffix indicates an ongoing action: burning

* -er: This suffix indicates a person or thing that burns: burner

* -able: This suffix indicates the ability to be burnt: burnable

Examples:

* The bread was burnt/burned.

* The fire was burning brightly.

* The stove has a powerful burner.

* Paper is very burnable.

The best suffix to use will depend on the specific context of your sentence.