* A misspelling: Could it be a variation of "cart wall" referring to the side of a cart?
* A proper noun: Perhaps a specific location, person, or product name.
* A technical term: It might be a specialized word within a particular field.
To give you a helpful sentence, I need more information! Please tell me:
* What do you think "carterwall" refers to?
* What is the context of the sentence you need?
Once I have more information, I can create a sentence using "carterwall" appropriately.