Mound over is a phrase that refers to the process of piling up objects or soil to create a raised surface. The word mound can be replaced with other synonyms like heap, pile, stack, or cluster. Similarly, the word over can be substituted with on top of, above, or atop. These synonyms can be used interchangeably depending on the context of the situation. For example, you can say, "I mounded over the sand to create a sandcastle," or "I piled the books on top of each other to make a neat stack." Synonyms for mound over can help diversify your vocabulary and improve your writing and speaking skills.