approximation vs overestimate

overestimate vs approximation

approximation and overestimate both are nouns.

approximation is not a verb while overestimate is a verb.

Word	Noun	Adjective	Verb	Adverb
approximation	Yes	No	No	No
overestimate	Yes	No	Yes	No

As nouns, overestimate is a hyponym of approximation; that is, overestimate is a word with a more specific, narrower meaning than approximation:

approximation: an approximate calculation of quantity or degree or worth
overestimate: a calculation that results in an estimate that is too high

Other hyponyms of approximation include scalage, credit, credit rating, dead reckoning, guess, guessing, guesswork, shot, guesstimate, guestimate, overestimation, overrating, overreckoning, underestimate, underestimation, underrating, underreckoning.

approximation (noun)	overestimate (noun)
the act of bringing near or bringing together especially the cut edges of tissue	a calculation that results in an estimate that is too high
the quality of coming near to identity (especially close in quantity)	an appraisal that is too high
an approximate calculation of quantity or degree or worth
an imprecise or incomplete account

approximation (verb)	overestimate (verb)
	make too high an estimate of
	assign too high a value to

Difference between approximation and overestimate

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