Genera are within families, not the other way around. Maybe read a book?

Also: the genus Panthera consists of 5 big cats. The other two big cats that aren’t in Panthera are the cougar, which is also colloquially called a panther, and the cheetah.

So, in fact, “panther” can refer to any big cat other than cheetahs.

Dude, you clearly know nothing about taxonomy or big cats. You just want to be pedantic, but you are flat out wrong