* Compound: Relish is made up of multiple ingredients, like vegetables, spices, and sometimes vinegar or other liquids. This means it's not a single pure substance.

* Mechanical mixture: The ingredients in relish are not chemically bonded together. They can be separated by physical means, like picking out the pickles or draining the liquid.

* Not an element: Elements are the simplest pure substances that cannot be broken down further (like oxygen or gold). Relish is definitely not an element.

So, relish is a combination of different substances that are mixed together physically, making it a compound mechanical mixture.