free time is time when you do not have any work to do, so that you can do whatever you want https://www.macmillandictionary.com/dictionary/american/free_1#free_1__34 leisure is time that is spent doing what you enjoy when you are not working or studying https://www.oxfordlearnersdictionaries.com/definition/english/leisure?q=leisure spare time is the time that is over and above what is needed https://www.merriam-webster.com/dictionary/spare

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They are pretty much used interchangeable :)