Synonyms for Joy (same or very similar meaning)
WordNet sense 1 (the emotion of great happiness):
joyfulness, joyousnessWordNet sense 2 (something or someone that provides pleasure; a source of happiness):
delight, pleasureWordNet sense 3 (feel happiness or joy):
rejoiceWordNet sense 4 (make glad or happy):
gladdenFrom the ODE community, based on WordNetadd/edit