What is the suffix for cast?

There isn't a single, definitive suffix for "cast." The word "cast" can be used as both a verb and a noun, and its meaning changes depending on the context. Here's a breakdown:

As a verb:

* -ing (present participle) - casting, e.g., "The actor was casting a spell."

* -ed (past participle) - cast, e.g., "The fishermen cast their nets."

* -er (agent) - caster, e.g., "The stagehand was a skilled caster."

As a noun:

* -ing (gerund) - casting, e.g., "The casting call drew many actors."

* -s (plural) - casts, e.g., "There were several casts of plaster on his arm."

So, the suffix depends on what grammatical form you're using and what meaning you want to convey.