cougar
Synonym discussion
Sense: noun/1
All four terms — cougar, puma, mountain lion, and panther — can refer to the same biological species (Puma concolor), but they differ in regional usage and connotation. 'Cougar' is the most widely recognised name in general English and in scientific literature. 'Puma' is the preferred term across Latin America and in many wildlife journals; it also appears in brand names and sports mascots, giving it a slightly more formal or international feel. 'Mountain lion' is the common name in the western United States and Canada — it emphasises the animal's habitat and is the term most hikers and ranchers use. 'Panther' is more confusing: it properly refers to the Florida panther subspecies and also to entirely different species (the black panther, which is a leopard or jaguar). Using 'panther' for a standard cougar can cause misunderstanding. For a learner: 'cougar' is always correct; use 'mountain lion' when speaking about North American wilderness, and 'puma' in scientific or Latin American contexts.
Etymology
The word 'cougar' entered English in the late 1700s from French 'couguar', which came from Portuguese 'çucuarana'. Portuguese explorers borrowed the word from the Tupi language of South America, where 'suasuarana' means 'similar to a deer' — a reference to the animal's brownish coat. The word has been used in English for the animal since the 1770s, and the slang sense for an older woman with a younger partner emerged in Canadian English in the early 2000s.