Sukkha is the Pali word which means happiness. It's basically the opposite of Dukkha. Dukkha and Sukkha. As to a difference between the Pali word Sukkha and normal joys in life, Sukkha would include the normal joys - so there's not actually a difference there. Sukkha also includes spiritual happiness. It's just the Pali word for happiness, joy, things that are more satisfactory than its opposite, which is unsatisfactoriness, Dukkha.