"Brick-topped" refers to something that features or is covered by bricks on its top. If you are looking for synonyms, you could use words that describe different aspects of this feature. For example, instead of "brick-topped," you could use "brick-capped," which implies that the bricks form a protective cap on top of the object. Alternatively, "brick-covered" might work if you want to emphasize the extent of the brick covering rather than the specific location of the bricks. Other options might include "brick-adorned," "brick-topped," or "brick-finished." Ultimately, the best synonym will depend on the context in which you are using the term.