Synonyms for Panther (same or very similar meaning)
WordNet sense 1 (a large spotted feline of tropical America similar to the leopard; in some classifications considered a member of the genus Felis):
jaguar, Felis onca, Panthera oncaWordNet sense 2 (large American feline resembling a lion):
cougar, painter, puma, catamount, Felis concolor, mountain lionFrom the ODE community, based on WordNetadd/edit