adder vs calculating machine

adder and calculating machine both are nouns.

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

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

adder: a machine that adds numbers
calculating machine: a small machine that is used for mathematical calculations; can be mechanical or electronic

Other hypernyms of adder include calculator.

adder (noun)	calculating machine (noun)
small terrestrial viper common in northern Eurasia	a small machine that is used for mathematical calculations; can be mechanical or electronic
a machine that adds numbers
a person who adds numbers