teletype machine vs telex machine

teletype machine and telex machine both are nouns.

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

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

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

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

teletype machine (noun)	telex machine (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