"Top-drest" is a word used to describe the act of adding a layer of fertilizing material on top of soil. However, there are various synonyms for this word that can also be used to express the same meaning. Some of these synonyms include "top-dressed," "overlaid," "covered," "layered," "topped," "mulched," "sprinkled," "spread," "coated," and "dressed." These synonyms can be used interchangeably depending on the context and the writer's preference. By using these synonyms, one can avoid repetition and add more variety to their writing, making it more engaging and informative.