* Cook is a noun and verb referring to the act of preparing food. It's a common word with many related terms, but no specific suffix is attached to it.
* Rook is a noun referring to a type of black bird or a chess piece. It's less common and doesn't have any widely used suffixes associated with it.
Possible options:
* -er: This suffix is often used to turn verbs into nouns, but it doesn't apply to "cook" as it's already a noun.
* -ing: This suffix can create present participles or gerunds, but it doesn't typically change the word class like "-er."
* -ery: This suffix is sometimes used to indicate a place associated with a specific activity, but it doesn't work with "cook" or "rook."
Conclusion:
There's no single, widely accepted suffix that works for both "cook" and "rook." You'd have to find creative or context-specific ways to use suffixes depending on the meaning you're trying to convey.