Answer:
Joy and happiness are both emotions where a person has feelings of contentment or satisfaction. But both these feelings may differ from each other based on the reasons causing the feeling and the nature of the feeling.
Joy is;
1. the emotion of great delight or happiness caused by something exceptionally good or satisfying; keen pleasure; elation: She felt the joy of seeing her son's success.
2. a source or cause of keen pleasure or delight; something or someone greatly valued or appreciated: Her prose style is a pure joy.
3. the expression or display of glad feeling; festive gaiety.
a state of happiness or felicity.
Happiness is;
1. the quality or state of being happy.
2. good fortune; pleasure; contentment; joy.