The term 'Hoover Rival' refers to three different vacuum cleaner brands: Eureka (6 letters), Oreck (5 letters), and Electrolux (10 letters). Eureka is an American company that manufactures vacuum cleaners, air purifiers, and other home appliances. Oreck is a brand of lightweight vacuum cleaners that are designed for easy use. Electrolux is a Swedish company that produces a wide range of home appliances, including vacuum cleaners.