teletype machine vs teleprinter

teletype machine and teleprinter both are nouns.

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

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

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

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

teletype machine (noun)	teleprinter (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