“Human” and “horse” are different species concepts. One individual cannot be a human and a horse in these same specific respects, so they are disjoint.
Yet both share animality:
Every human is an animal.
Every horse is an animal.
Nevertheless, no human is a horse.
Being contained under a wider third concept does not make the original two equal or inclusive. The decisive question is whether one individual can fall under both at once.
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Four Relations Between Universals and Relative Particularity
“Human” and “horse” are different species concepts. One individual cannot be a human and a horse in these same specific respects, so they are disjoint.
Yet both share animality:
Every human is an animal.
Every horse is an animal.
Nevertheless, no human is a horse.
Being contained under a wider third concept does not make the original two equal or inclusive. The decisive question is whether one individual can fall under both at once.