The Collaborative International Dictionary of English v.0.48:

Water hare \Wa"ter hare\ (Zool.)
   A small American hare or rabbit (Lepus aquaticus) found on
   or near the southern coasts of the United States; -- called
   also water rabbit, and swamp hare.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Water rabbit \Wa"ter rab"bit\ (Zool.)
   See Water hare.
   [1913 Webster]