overvaluation

nouns

an appraisal that is too high
overappraisal, overestimate, overestimation, overvaluation
is derived from
overvalue
too high a value or price assigned to something
overvaluation
is derived from
overvalue
is a type of (narrower)
an appraisal of the value of something
"he set a high valuation on friendship"
evaluation, rating, valuation