adding machine vs calculator

adding machine and calculator both are nouns.

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

As nouns, calculator is a hypernym of adding machine; that is, calculator is a word with a broader meaning than adding machine:

adding machine: a calculator that performs simple arithmetic functions
calculator: a small machine that is used for mathematical calculations; can be mechanical or electronic

Other hypernyms of adding machine include calculating machine.

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