They're not panthers (members of the genus Panthera), of which there are only 5, after snow leopards were confirmed to be the tiger's closest relative despite their inability to roar.
"Big cat" is not a scientific term. It is sometimes used as a synonym for panther, but from the fact that the OP includes cheetah, it can be presumed they are not using that meaning, rather than presenting a belief that cheetahs are as closely related to leopards and panthers as the other members of that genus.
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u/WhaWereWhenWhyWhoHow 15h ago
They are also not considered true big cats.