Here are some possibilities, depending on what you're trying to say:
If you're talking about its shape:
* Bowl: A bowl is deeper and often wider than a saucer.
* Plate: A plate is larger and flatter than a saucer.
* Cup: While a cup is also a shallow vessel, it is usually meant for drinking, not holding a cup.
If you're talking about its function:
* Cup: This is the most common and direct antonym when discussing the function of holding a cup.
* Stand: A stand is something that supports something else, like a saucer does for a cup, but it might not be a dish.
If you're talking about the material it's made of:
* Plate: This is a more general term, but it can be used to contrast the shape of a saucer with a larger, flat dish made of a different material.
Ultimately, the best antonym for "saucer" depends on the specific context and what you're trying to convey.