The only 5 letter one that I can come up with is COBRA (1925)
Rudolph Valentino, Nita Naldi, Casson Ferguson, Gertrude Olmstead. Impoverished Italian nobleman takes a job with a New York antique dealer and falls in love with his secretary. Complications abound when Rodrigo is pursued by a gold-digger who believes he's still wealthy and becomes romantically torn between the two women.