The Collaborative International Dictionary of English v.0.48:

hypernymy \hypernymy\ n.
   the relation of being superordinate or belonging to a higher
   (more abstract) rank or class. Inverse of hyponymy.

   Syn: superordination.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

hypernymy
    n 1: the semantic relation of being superordinate or belonging
         to a higher rank or class [syn: hypernymy,
         superordination]