estimator vs calculator

estimator and calculator both are nouns.

Word	Noun	Adjective	Verb	Adverb
estimator	Yes	No	No	No
calculator	Yes	No	No	No

As nouns, estimator and calculator are synonyms defined as:

estimator and calculator: an expert at calculation (or at operating calculating machines)

Other synonyms of estimator include computer, figurer, reckoner.

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