- hummer - a singer who produces a tune without opening the lips or forming words
--1 is a kind of singer, vocalist, vocalizer, vocaliser
Derived form: verb hum1 - fastball, heater, smoke, hummer, bullet - (baseball) a pitch thrown with maximum velocity; "he swung late on the fastball"; "he showed batters nothing but smoke"
--2 is a kind of pitch, delivery
--2 has particulars: slider