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caster

/ˈkæstə(r)/ /ˈkæstər/
Visual illustration of caster: A wheeled assembly attached to a larger object at its base to facilitate rolling. A caster usually consists of a wheel (which may be plastic, a hard elastomer, or metal), an axle, a mounting provision (usually a stem, flange, or plate), and sometimes a swivel (which allows the caster to rotate for steering).
noun

A wheeled assembly attached to a larger object at its base to facilitate rolling. A caster usually consists of a wheel (which may be plastic, a hard elastomer, or metal), an axle, a mounting provision (usually a stem, flange, or plate), and sometimes a swivel (which allows the caster to rotate for steering).

Visual illustration of caster: A shaker with a perforated top for sprinkling condiments such as sugar, salt, pepper, etc.
noun

A shaker with a perforated top for sprinkling condiments such as sugar, salt, pepper, etc.