The Puma, Cougar, Panther and Mountain Lion are all the same animal.
But, according to the Urban Dictionary:
A Puma is an attractive woman in her late 20s or early 30s. She is a pre-cougar/urban cougar.
A Milf is a mother, whether married, separated or divorced, that a male individual sees as physical attractive enough to want to have sexual intercourse with them.
A Cougar is an older woman who frequents clubs in order to score with a much younger man. The cougar can be anyone from an overly surgically altered wind tunnel victim, to an absolute sad and bloated old horn-meister, to a real hottie or milf.
A Mountain Lion is similar to a cougar, only it refers to an UN-attractive older woman seeking younger men. The only difference between the terms mountain lion and cougar are that cougars are usually somewhat attractive, and mountain lions are usually quite ugly. The mountain lion’s natural habitat is at bars.
A Panther is a lady who prefers and pursues older men/the opposite of a cougar.