teletype machine vs telex

teletype machine and telex both are nouns.

Word	Noun	Adjective	Verb	Adverb
teletype machine	Yes	No	No	No
telex	Yes	No	Yes	No

As nouns, teletype machine and telex are synonyms defined as:

teletype machine and telex: a character printer connected to a telegraph that operates like a typewriter

Other synonyms of teletype machine include teleprinter, teletypewriter, telex machine.

teletype machine (noun)	telex (noun)
a character printer connected to a telegraph that operates like a typewriter	a character printer connected to a telegraph that operates like a typewriter

teletype machine (verb)	telex (verb)
	communicate by telex