automatic teller vs automatic teller machine

automatic teller and automatic teller machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
automatic teller	Yes	No	No	No
automatic teller machine	Yes	No	No	No

As nouns, automatic teller and automatic teller machine are synonyms defined as:

automatic teller and automatic teller machine: an unattended machine (outside some banks) that dispenses money when a personal coded card is used

Other synonyms of automatic teller include ATM, automated teller, automated teller machine, cash dispenser, cash machine.

automatic teller (noun)	automatic teller machine (noun)
an unattended machine (outside some banks) that dispenses money when a personal coded card is used	an unattended machine (outside some banks) that dispenses money when a personal coded card is used