Is heap the opposite of clean?

Answer 1

No. The noun "heap" is a pile, and to heap is to pile up. For laundry, however, it might be the alternative to cleaning it.

The opposite of clean is dirty, or soiled. The opposite verb is also to dirty or soil.

Answer 2

No, "heap" and "clean" are not direct opposites. A heap refers to a pile or mass of objects or materials, while clean refers to the state of being free from dirt or impurities.