cercus / circus [ˈsɜrkəs]
cercus – n. (pl. cerci)– (Zool.) either of a pair of small appendages at the end of the abdomen of some insects and other arthropods
circus – n. – 1. a travelling show of performing animals, acrobats, clowns, etc.; a performance by them; 2. informal – a situation characterized by lively, chaotic behaviour; 3. Brit. – an open space in a town where several streets converge