What are some words that end with the suffix oast?

The suffix "-oast" is not a common English suffix. It's likely you're thinking of "-oast" as part of a larger word, like "roast".

Here are some words that include "-oast" as part of a larger word:

* Roast (verb and noun) - to cook food by dry heat, usually in an oven.

* Boast (verb and noun) - to speak with excessive pride or self-confidence.

* Toast (verb and noun) - to brown bread or other food by heat.

Let me know if you had another word in mind, and I'll do my best to help!