Ariz. Rev. Stat. § 47-3104
A. Except as provided in subsections C and D, "negotiable instrument" means an unconditional promise or order to pay a fixed amount of money, with or without interest or other charges described in the promise or order, if it:
3. Does not state any other undertaking or instruction by the person promising or ordering payment to do any act in addition to the payment of money, but the promise or order may contain:
F. "Check" means:
2. A cashier's check or teller's check.
An instrument may be a check even though it is described on its face by another term, such as "money order".
H. "Teller's check" means a draft drawn by a bank:
I. "Traveler's check" means an instrument that: