"Wash" is a verb on its own, and we can add suffixes to it to create other words, like:
* Washing: This is the present participle of the verb, used for ongoing actions.
* Washed: This is the past tense and past participle of the verb, used for completed actions.
* Washable: This adjective means something can be washed.
* Washer: This noun refers to a person or a machine that washes.
* Washroom: This noun refers to a room used for washing.
These are examples of suffixes being added to "wash" to create new words, but there isn't a single suffix that defines what "wash" means.