Shir Ha-Ma'alot #35

"Who created joy and happiness"
In the final blessing of the sheva brachot, there are ten expressions of happiness listed: 1. Sason - joy. 2. Simchah - happiness. 3. Gilah - rejoicing. 4. Rinah - jubilation. 5. Ditzah – pleasure. 6. Chedvah - delight. 7. Ahavah - love. 8. Achavah – fraternity. 9. Shalom - peace. 10. Rei’ut - friendship.
Our Rabbis already stated that "simchah - happiness" is referred to by ten names: Gilah - rejoicing, rinah – jubilation, sisa - joy, alisa (with a samech) - joy, aliza (with a zayen) - joy, petzichah – joyful, tzahalah - rejoicing, chedvah - delight, ha-rei’ah – friendship or ditzah - pleasure (Pesikta Kama #2 on Yeshayahu 54:1). We are surely a joyful Nation: the Torah causes joy (Tehillim 19:9); "the commands of Hashem are upright making the heart rejoice;" the mitzvot cause joy, and the Master of the Universe is happy through us (Tehillim 104:31); "Hashem will rejoice in his actions."