The word "immergence" refers to the act of emerging or rising to the surface. There are several synonyms for this word that can be used depending on the context of the sentence. Some alternatives to "immergence" include emergence, surfacing, rising, ascent, ascension, elevation, and upsurge. These words can be used interchangeably to describe the act of something coming to the surface or rising up. For example, "the emergence of the sun over the horizon" or "the upsurge of emotions within her." Each of these words carries a slightly different connotation, so it's important to choose the right one for the specific context.