What is the prefix and suffix of rest?

The word "rest" doesn't have a prefix or suffix. It is a root word on its own.

However, you can add prefixes and suffixes to create new words with related meanings:

* Prefixes:

* re- (meaning "again" or "back") - restart, restate, reassure

* un- (meaning "not") - unrest, unrestful

* Suffixes:

* -ful (meaning "full of") - restful

* -less (meaning "without") - restless

* -ing (present participle) - resting

* -ed (past participle) - rested