overestimation vs overestimate

overestimation and overestimate both are nouns.

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

As nouns, overestimation and overestimate are synonyms defined as:

overestimation and overestimate: a calculation that results in an estimate that is too high

Other synonyms of overestimation include overrating, overreckoning.

As nouns, overestimation and overestimate are synonyms defined as:

Other synonyms of overestimation include overappraisal, overvaluation.

overestimation (noun)	overestimate (noun)
a calculation that results in an estimate that is too high	a calculation that results in an estimate that is too high
an appraisal that is too high	an appraisal that is too high

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