estimator vs computer

estimator and computer both are nouns.

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

As nouns, estimator and computer are synonyms defined as:

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

Other synonyms of estimator include calculator, figurer, reckoner.

estimator (noun)	computer (noun)
an expert at calculation (or at operating calculating machines)	a machine for performing calculations automatically
	an expert at calculation (or at operating calculating machines)