Linked from
The 9 pages that link to Spice, each with the reason it gives.
Black pepperNarrower topic: Black pepper is traded and used as a spice.
KetchupNarrower topic: Spices add the varied aromatic notes that distinguish ketchup recipes.
NutmegNarrower topic: Nutmeg is a seed-derived spice used in both sweet and savory cooking.
Alligator pepperNarrower topic: Alligator pepper’s pungent seeds are traded and used as a spice.