Can work be categorized as a hobby?

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When people talk about hobbies, they usually related to reading, listening to music, and web surfing etc....... Can working be one of the hobbies? Some people just are workaholics. They deems work as part of their entertainment life. Work can fulfill them. To make a project succeed; to accomplish something no one would done the same before. It is all part of hard working. Can you relate working as your hobby too?