miscount
/ˈmɪskount/Definitions
1. verb
to count or estimate incorrectly; make a mistake in counting or reckoning
“The cashier miscounted the change and gave me too little money.”
2. noun
an error in counting or reckoning; a mistake in estimating the number of something
“The miscount of the votes led to a controversy in the election.”
3. noun
a person who makes a mistake in counting or reckoning
“The auditor caught the miscount and corrected the financial records.”