What's the difference between overtime and overwork?

Overtime is a noun. It means extra time a person works. In casual English, we sometimes say OT. 
Ex: I usually finish work at five o’clock. Yesterday, I did two hours of OT. (I finished work at seven o’clock.) 
Ex: When we work overtime, we get paid time and a half. 

We often say that we “work”, “do”, or “put in” overtime. 
• I’m not finished with this report, so I have to do a little overtime tonight. 
• Last week, I put in about eight hours of overtime. 

Overwork is a verb. It means to work too much. When someone or something is overworked (adjective) they are harmed or even may even die. 

Ex: All these operations overworked my computer and it died. 
Ex: Office workers in Tokyo have reputation for overworking themselves. 

Of course, there are some other expressions with very similar meanings.
• Burn yourself out.
• Run yourself into the ground. 
• Work your fingers to the bone. 
• Work your tail off. 

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