The Exact Difference Between Seasoning And Spice - Tasting Table
Briefly

"All spices can be any part of a plant, except for the leaf. Berries, stems, seeds, buds, bark, and roots are examples of spices."
"Seasonings represent a much broader category and can be a dry mixture of spices, herbs, salt, and sometimes sugar, or it can be a wet sauce like soy sauce..."
Read at Tasting Table
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