overvaluation vs overestimate

overvaluation and overestimate both are nouns.

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

As nouns, overvaluation and overestimate are synonyms defined as:

Other synonyms of overvaluation include overappraisal, overestimation.

overvaluation (noun)	overestimate (noun)
too high a value or price assigned to something	a calculation that results in an estimate that is too high
an appraisal that is too high	an appraisal that is too high

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