automatic teller machine vs ATM

automatic teller machine and ATM both are nouns.

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

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

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

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

automatic teller machine (noun)	ATM (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
	a means of digital communications that is capable of very high speeds; suitable for transmission of images or voice or video as well as data