【Happiness】 , 【felicity】 ,  【beatitude】 ,  【blessedness】 ,  【bliss】  all denote the enjoyment or pleasurable satisfaction that goes with well-being.

【Happiness】 is the generic term applicable to almost any state of enjoyment or pleasurable satisfaction especially as based on one’s well-being, security, effective accomplishments, or satisfied wishes.

【Felicity】 , denoting intense 【happiness】 is suited chiefly to formal expressions (as of congratulation) or dignified description.

【Beatitude】 is supreme 【felicity】 .

【Blessedness】  implies a feeling of being highly favored, especially by the Supreme Being, and often, a deep joy arising from the purest domestic, benevolent, or religious affections;  【bliss】  adds to  【blessedness】  a suggestion of exalted or ecstatic 【felicity】 ; both  【blessedness】  and  【bliss】 , like  【beatitude】 , often refer to the joys of heaven.