morse code, cqd, radiotelephone, semaphore, interferer, bosun, transmitter, teleprinter, homing device, echo sounder, boatswain, sigint, birdcall, morse, phonetic alphabet, boop, wireless telegraphy, dipole antenna, beep, hydrophone, radiolocation, counterfire, circuitry, artillerymen, loran, annunciator, radios, bleeper, grenadiers, inertial guidance, distracter, loadmaster, stealthiness, capstan, cannoneers, klaxon, mouselike, strobe light, recon, infrared ray, telemetry, sounders, vulcan, heterodyne, penlight, pelage, inertial navigation system, embouchure, capitaine, superior colliculus, electromagnetic, microswitch, antennae, microcircuit, onomatopoeia, phoneme, hider, glottal, commo, lanternfish, telemeter, fowler, dogtag, claxon, pneumatic drill, cva, auditory, sensors, cuing, oersted, phrasal verb, artificer, batterie, gunner, breeches buoy, grunts, quartermaster, retrorocket, comint, spectrograms, graviton, breacher, obscurant, galvanometer, cartesian coordinates, vowel sound, gib, foghorns, masker, tuning fork, sensory neuron, mantling, rheostat, plosive, ascender, christiaan huygens, sapper, greatcoat, photoflash, quarterdeck, eyehole, sibilance, admirer, alderman, andrews, apprentice, bailiff, barre, commissary, cops, count, davis, derrick, deserving, dignitary, friend, gaoler, hugo, jeweler, judge, keeper, locksmith

bell ringer, toller, whistler

communicator

signaller