"On" is a common preposition used to indicate the position of something in relation to another object or surface. However, there are several synonyms for "on" that can be used to add variety to your writing. Some examples include "atop," "upon," "perched," "resting," "positioned," "sitting on," "lying on," "settled," "placed," and "attached to." These synonyms can also be used to add more depth and detail to a sentence, making it more engaging and descriptive for the reader. So next time you're tempted to use "on," try incorporating one of these synonyms to enhance your writing.