General synonyms:
* Happiness (most common and closest in meaning)
* Delight (stronger intensity, often with a specific source)
* Pleasure (often associated with physical or sensory enjoyment)
* Bliss (intense and overwhelming joy, often spiritual)
* Elation (sudden and intense feeling of happiness)
* Jubilation (a feeling of great joy and triumph)
* Rapture (an overwhelming feeling of ecstasy)
* Exuberance (a state of lively energy and excitement)
Synonyms focusing on specific types of joy:
* Contentment (calm and peaceful happiness)
* Gratitude (joy derived from recognizing good fortune)
* Satisfaction (joy from achieving something)
* Fulfillment (a sense of deep inner satisfaction)
* Ecstasy (extreme joy and intense pleasure)
* Glee (a feeling of great happiness and delight, often mischievous)
* Merriment (joyous and cheerful activity)
Synonyms with a negative connotation:
* Exultation (joy at another's misfortune)
* Triumph (joy at victory, often over another)
The best synonym for "joy" depends on the context and the specific shade of meaning you want to convey.