Antonyms for the word "over compensation" could include under compensation, adequacy, balance, or equivalence. Under compensation refers to receiving less than what is deserved or earned. Adequacy is the state of having enough or sufficient resources to meet one's needs or expectations. Balance refers to a state of equilibrium or equal distribution, without excess or deficiency. Equivalence is the quality of being equal in value or worth. All of these antonyms suggest a state of moderation, fairness, or equilibrium, rather than excessive or unbalanced compensation. By using these antonyms, we can communicate ideas of fairness, balance, and adequate reward, rather than excessive or disproportionate compensation.