What do you think Aristotle would have to say about the theory of ideas or forms that Plato expounds in the Republic?

What do you think Aristotle would have to say about the theory of ideas or forms that Plato expounds in the Republic? Does he also have a theory of ideas, or forms, that we discover primarily in his Physics and Metaphysics? If so, how is it different, or not, from Platos? Which account is more credible in terms of accounting for what it means to have knowledge, and explaining what, in these cases, knowledge must grasp? What is the relevance, if any, to his ethical and political thought? (Please spend the majority of your essay discussing Aristotle, not Plato.)