The word you're looking for is "cable." A telegram from overseas is often referred to as a "cablegram," and it is a message sent via a submarine cable or other means of communication. This term highlights the method of transmission, which was historically significant before the advent of modern communication technologies.
cablegram
NONE!
An "able" one.
unatchable
The word telephone has three syllables. Tel-e-phone
The root word for telegram is "tele," which comes from the Greek word "tele," meaning distant or remote, and "gram," which comes from the Greek word "gramma," meaning letter or message. Together, they form the word "telegram," referring to a message sent through a telecommunication system over a distance.
"He went overseas."
Example sentence - He hoped one day he would be able to fly airplanes overseas.
Zimmerman telegram
yes
The combining forms in the word "telegram" are "tele-" meaning distant or far off, and "-gram" meaning message or something written.
It as charged a penny for a word.