How many syllables in tower?

Definition of tower:

tower (noun):

a structure taller than its diameter; can stand alone or be attached to a larger building.

a tall, usually square or circular structure, sometimes part of a larger building and usually built for a specific purpose

a building or structure typically higher than its diameter and high relative to its surroundings that may stand apart (such as a campanile) or be attached (such as a church belfry) to a larger structure and that may be fully walled in or of skeleton framework (such as an observation or transmission tower)