Slathers is a verb that typically refers to the act of spreading something thickly and generously over a surface. However, there are several alternative synonyms that can be used in its place depending on the context and intended emphasis. For instance, one could use 'smear', 'coat', 'layer', 'spread', 'cover', or 'daub' to signify the action of applying something in abundance. Similarly, words such as 'heap', 'load', 'pile', 'drench', or 'lavish' can be used to highlight the degree or intensity of the application. Ultimately, the choice of which synonym to use depends heavily on the intended meaning and the writer's creative choices.