approximation vs underestimate

underestimate vs approximation

approximation and underestimate both are nouns.

approximation is not a verb while underestimate is a verb.

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

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

approximation: an approximate calculation of quantity or degree or worth
underestimate: an estimation that is too low; an estimate that is less than the true or actual value

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

approximation (noun)	underestimate (noun)
the act of bringing near or bringing together especially the cut edges of tissue	an estimation that is too low; an estimate that is less than the true or actual value
the quality of coming near to identity (especially close in quantity)
an approximate calculation of quantity or degree or worth
an imprecise or incomplete account

approximation (verb)	underestimate (verb)
	make a deliberately low estimate
	make too low an estimate of
	assign too low a value to

Difference between approximation and underestimate

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