The Rufous Rubber Cup is a unique and intriguing phrase that refers to a small, cup-shaped object made of rubber and colored in shades of reddish-brown. This particular phrase may not have many synonyms, as it is a highly specific and descriptive term. However, it might be possible to find alternative descriptions or phrases that could convey a similar meaning or feeling. Some possibilities may include using words like "copper-colored" or "rust-hued" to describe the cup's color, while words like "flexible", "resilient", or "elastic" could describe the rubbery texture of the object. Ultimately, though, the best way to truly capture the essence of the Rufous Rubber Cup is likely to use the phrase itself.