IPA: //tɛlɪˈfoʊnɪst//
KK: /tɛlɪˈfoʊnɪst/
A person who operates a telephone switchboard or manages telephone calls.
The telephonist connected the call to the right department.
Telephonist → It is formed from "tele-" (from Greek "tēle", meaning far) and "phone" (from Greek "phōnē", meaning voice or sound) with the suffix "-ist" (meaning one who practices or is concerned with). A telephonist is one who works with sound or voice over a distance, typically in the context of telephone communication.
Think of 'far' ('tele-') and 'voice' ('phone') to remember that a telephonist is someone who communicates voices over long distances.