number cruncher vs figurer

number cruncher and figurer both are nouns.

Word	Noun	Adjective	Verb	Adverb
number cruncher	Yes	No	No	No
figurer	Yes	No	No	No

As nouns, figurer is a hypernym of number cruncher; that is, figurer is a word with a broader meaning than number cruncher:

Other hypernyms of number cruncher include calculator, computer, estimator, reckoner.

number cruncher (noun)	figurer (noun)
a computer capable of performing a large number of mathematical operations per second	an expert at calculation (or at operating calculating machines)
someone able to perform complex and lengthy calculations