raiser

A person who raises or is occupied in raising anything, as buildings, plants, animals, etc.

That which raises; a device of any kind used for raising, lifting, or elevating anything: as, a water-raiser.

One who, or that which, raises (in various senses of the verb).

A person or thing that raises.

someone concerned with the science or art or business of cultivating the soil

a bridge partner who increases the partner’s bid