| HEADSET | It's used in radio communication |
| TANGO | One of the two codewords used in radio communication that shares its name with a ballroom dance (5) |
| ROGER | Masculine name / 'received' (used in radio communication) |
| ROMEO | A code word representing the letter R, used in radio communication (5) |
| UNIFORM | Word used in radio communication between Tango and Victor (7) |
| INDIA | Code word for the letter I, used in radio communication (5) |
| ECHO | Codeword between Delta and Foxtrot, used in radio communication (4) |
| SIERRA | Spanish word for a mountain range; or, the codeword between Romeo and Tango used in radio communication (6) |
| BRAVO | Codeword representing the second letter of the alphabet, used in radio communication or to accurately spell a name over the phone (5) |
| OVER | Word used in radio communication to indicate that the speaker has finished transmitting and is expecting a response (4) |
| MIKE | Codeword between Lima and November, used in radio communication (4) |
| HOVER | Remain in the air getting hard word in radio communication (5) |
| ALFA | Bravo's predecessor, in radio communication |
| WILCO | Term of agreement (in radio communication) |
| DELTA | Codeword for D in radio communication (5) |
| SOLARFLARE | *Cause of problems in radio communication |
| INBOARD | Kind of motor, note, used in radio broadcast |
| INROAD | Offensive name used in radio broadcast (6) |
| XENON | Inert gas used in radio valves (5) |
| RUBIDIUM | Silver-white element used in radio vacuum tubes (8) |
