The Collaborative International Dictionary of English v.0.48:

Corival \Co*ri"val\ (k[-o]*r[imac]"val), n.
   A rival; a corrival.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Corival \Co*ri"val\, v. t.
   To rival; to pretend to equal. --Shak.
   [1913 Webster] Corivalry