Synonyms for Kiln:

n.

furnace (noun)
radiator, infrared lamp, register, coke oven, fireplace, burner, steam heater, smelter, Bunsen Burner, oven, firebox, heater, hearth, sun lamp, blast furnace, induction heater, Franklin stove, coal stove, jet, warmer, potbellied stove, solar heater, water heater, furnace.
hearth (noun)
reduction furnace, pottery oven.
oven (noun)
furnace, fire, oven, hearth.
pottery (noun)
fire, ceramics, knead, slip, potter, china clay, pottery, potter's wheel.

Other synonyms:

pottery
fire, ceramics, knead, slip, potter, china clay, pottery, potter's wheel.
Other relevant words:
knead, pottery, slip, ceramics, fire, potter.