When it comes to describing "flat stores," there are numerous synonyms to choose from, each with its own subtle connotations. One possibility is "level stores," which suggests a uniformity and lack of variation. Another option is "horizontal stores," which implies a broad, expansive layout. Meanwhile, "low stores" emphasizes the lack of height or elevation, perhaps suggesting the absence of grandeur or prominence. "Plain stores" might indicate a lack of adornment or decoration, while "simple stores" could imply a straightforward, uncomplicated layout. Ultimately, the choice of synonym depends on the specific context and message that you want to convey.