Substance, quantity, quality and the other categories are called highest genera because classical classification does not posit a further shared real genus above them.
Body and its subdivisions fall under substance. Sensible, psychic and other kinds of quality fall under quality.
The term “existent” may apply to all ten, but in this system it is not treated as a single common real genus above them. A word's applicability to many things does not by itself make it a genus.
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Highest Genera and the Ten Categories
Substance, quantity, quality and the other categories are called highest genera because classical classification does not posit a further shared real genus above them.
Body and its subdivisions fall under substance. Sensible, psychic and other kinds of quality fall under quality.
The term “existent” may apply to all ten, but in this system it is not treated as a single common real genus above them. A word's applicability to many things does not by itself make it a genus.