IPA: /ˈoʊvərplʌs/
KK: /ˈoʊvərpləs/
A quantity that is more than what is needed; an extra amount or surplus.
The company had an overplus of resources after the project was completed.
Overplus → It is formed from "over-" (meaning excessive or beyond) and "plus" (from Latin "plus", meaning more). The word "overplus" refers to an excess or surplus amount beyond what is needed or expected.
Think of having "more" ('plus') than what is necessary, which is what "overplus" means.
No commonly confused words.