WordNet sense 1 (a recompense for worthy acts or retribution for wrongdoing):

payoff, wages

WordNet sense 2 (benefit resulting from some event or action):

advantage

WordNet sense 3 (bestow honor or rewards upon):

honor, honour

WordNet sense 4 (act or give recompense in recognition of someone's behavior or actions):

repay, pay back

WordNet sense 5 (an act performed to strengthen approved behavior):

reinforcement

WordNet sense 6 (strengthen and support with rewards):

reinforce