Formally pluto is a dwarf planet (new class formed after discovery of many such bodies). But you're right, some prefer to call Pluto-Charon a binary system bc it rotates around common center of gravity which is outside of both bodies.
To call Charon a Pluto's moon is a tradition. Pluto is bigger after all - family portrait as is
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Thanks for the clarifications! We can probably say that everything is life is, at the end of the day, always a matter of size :p