Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun heater

2 senses of heater

Sense 1
heater, warmer -- (device that heats water or supplies warmth to a room)
       => device -- (an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water")

Sense 2
fastball, heater, smoke, hummer, bullet -- ((baseball) a pitch thrown with maximum velocity; "he swung late on the fastball"; "he showed batters nothing but smoke")
       => pitch, delivery -- ((baseball) the act of throwing a baseball by a pitcher to a batter)