calculating machine vs calculator

calculating machine and calculator both are nouns.

Word	Noun	Adjective	Verb	Adverb
calculating machine	Yes	No	No	No
calculator	Yes	No	No	No

As nouns, calculating machine and calculator are synonyms defined as:

calculating machine and calculator: a small machine that is used for mathematical calculations; can be mechanical or electronic

calculating machine (noun)	calculator (noun)
a small machine that is used for mathematical calculations; can be mechanical or electronic	a small machine that is used for mathematical calculations; can be mechanical or electronic
	an expert at calculation (or at operating calculating machines)