What's the difference between rejoice and happy?
happy is the state of emotion a person can be in
rejoice is a verb. For example when a person is happy they do rejoice.
-He rejoiced when he found out it was a boy.
This statement explains that he is happy already because of his actions of rejoicing.
-You will rejoice.
This statement a person will become happy or something will make them happy, hence cause them to rejoice