Is $ \ {y}'' + \sin\ {y '} = 0 $ Differential Equation?

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$$ \ {y}'' + \sin\ {y '} = 0 $$

Order is 2

While degree is not defined.

Is this a differential equation ?

If yes , then why is the degree not defined ?

If no , then why is the order defined if it is not a differential equation ?

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It is a Ordinary Differential Equation, Second-Order, Non-linear, and the basis of my answer is coming of the First course in Differential Equations by Dennis Zill.