The problem I see though, is our dependence upon Platonic Forms ultimately. I like using etymology and history for that reason. A concept is a term from the 17th century when they believed, due to the anatomical structure of the brain, ideas might get "birthed" into "concepts" - "conceive an idea" things like that. Idea is a term from Plato regarding Forms; a place beyond time and space where forms are somehow perfect. These cultural assumptions lie deep within the language, littered throughout it. The metaphors have not lost their power, I don't think. Our unawareness of their origin doesn't take away from the force it brings to our assumptions about stuff. Real? Substance? Concept? if you're dealing with a dichotomous outlook, you can't cross it. But if you're willing to take things into account that go beyond a particular schema in order to find answers, you have a stronger chance. For example, ,when Philosophy has taken you as far as it can go on an idea, then you might have to move over to cognitive science. When cognitive science fails, you may have to more over to literature, etc.