Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun overestimation

2 senses of overestimation

Sense 1
overestimate, overestimation, overvaluation, overappraisal -- (an appraisal that is too high)
       => appraisal, estimate, estimation -- (a document appraising the value of something (as for insurance or taxation))

Sense 2
overestimate, overestimation, overrating, overreckoning -- (a calculation that results in an estimate that is too high)
       => estimate, estimation, approximation, idea -- (an approximate calculation of quantity or degree or worth; "an estimate of what it would cost"; "a rough idea how long it would take")