Word Study
headphone
OXFORD DICTIONARY
headphone, n. (usu. in pl.) a pair of earphones joined by a band placed over the head, for listening to audio equipment etc.
THESAURUS
headphone
acoustical network, capacitor speaker, coaxial speaker, cone, crossover network, diaphragm, dynamic speaker, earphone, electrodynamic speaker, electromagnetic speaker, electrostatic speaker, excited-field speaker, full-fidelity speaker, headset, high-fidelity speaker, high-frequency speaker, horn, loudspeaker, low-frequency speaker, midrange speaker, monorange speaker, moving-coil speaker, permanent magnet speaker, radiophone, radiotelephone, speaker, speaker system, speaker unit, triaxial speaker, tweeter, voice coil, wireless, wireless telephone, wooferFor further exploring for "headphone" in Webster Dictionary Online