Legal Question in Business Law in California

Yes. Although a contract must meet the legal requirements to be a contract, there is no requirement that a document have the word "contract" in the title.

A contract is really nothing more than a legally enforceable agreement. So, yes, a form that creates a legally enforceable agreement would be a contract. Also, in some contexts, such a the sale of goods between merchants, and sometimes between merchants and consumers, a form such as a Purchase Order can become a contract if it is accepted and acted on.