underestimate vs approximation

approximation vs underestimate

underestimate and approximation both are nouns.

underestimate is a verb but approximation is not a verb.

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

As nouns, approximation is a hypernym of underestimate; that is, approximation is a word with a broader meaning than underestimate:

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

Other hypernyms of underestimate include estimate, estimation, idea.

underestimate (noun)	approximation (noun)
an estimation that is too low; an estimate that is less than the true or actual value	the act of bringing near or bringing together especially the cut edges of tissue
	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

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

Difference between underestimate and approximation

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