Elementary (A2)
IPA: /tɛˈlɛfənər/
KK: /tɛˈlɛfənər/
Definition
A person who makes phone calls, often for business purposes.
Example
The telephoner contacted several clients to discuss their needs.
Conversation

I received a call from a telephoner trying to sell me a new service.

Those calls can be really annoying sometimes.

Right? I usually just hang up on the telephoner immediately.

Same here! It's hard to find a good time to talk to them.
Synonyms & Antonyms
Synonyms
caller
communicator
interlocutor
Antonyms
listener
recipient
receiver
Root Explanation
Telephoner → It is formed from "tele-" (from Greek "tēle", meaning far) and "phoner" (from French "phoner", meaning to call). The word "telephoner" means to call someone from a distance.
Memory Tip
Think of calling someone from 'far away' ('tele-') — that's why 'telephoner' means to call someone.
Visually Confused Words
retelephone
telpher
pretelephone
pantelephone
thelephora