A chimera is not commonly something that is "imagined or dreamt", rather than a combination of multiple different things fused together (like the mythical creature of origin). Also, please allow "not real" as an acceptable answer for this category.

To Wolf: Thanks for the comment, though saw it too late! I think I used a secondary definition for chimera. I also changed it to include "real or reality" as among the terms to be accepted in the connection.