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Walking sticks (the insects) procreate. If they did not procreate there wouldn't be any.
Walking sticks (the kind you use when you go hiking) do not procreate. They are made out of dead wood.
No the word procreate is not a noun. It is a regular verb.
By definition, there is no difference. A dictionary will mention as one of its definitions "to create" under defining "procreate".
They don't.
Have children, procreate.