Both differentia and property may be distinctive of a species, but they play different logical roles.
Rational — a constituent of human essence in this classical account; therefore differentia.
Capable of laughter — distinctive but outside that essence; therefore property.
Being conspicuous or distinctive is not the test. Essentiality is the decisive distinction.
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Property versus differentia
The Five Universals: Genus, Species, Differentia, Property, Common Accident
Both differentia and property may be distinctive of a species, but they play different logical roles.
Rational — a constituent of human essence in this classical account; therefore differentia.
Capable of laughter — distinctive but outside that essence; therefore property.
Being conspicuous or distinctive is not the test. Essentiality is the decisive distinction.