Use human nature as the focal species:
Genus: animal — essential and common to other kinds.
Species: human — shared by Zayd, Amr and Bakr.
Differentia: rational — the essential human distinction.
Property: capable of laughter — distinctive but outside essence.
Common accident: walking — shared with other kinds and outside essence.
Each term has a different role relative to the focal nature.
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All five universals in one worked example
The Five Universals: Genus, Species, Differentia, Property, Common Accident
Use human nature as the focal species:
Genus: animal — essential and common to other kinds.
Species: human — shared by Zayd, Amr and Bakr.
Differentia: rational — the essential human distinction.
Property: capable of laughter — distinctive but outside essence.
Common accident: walking — shared with other kinds and outside essence.
Each term has a different role relative to the focal nature.