prince — a treatise on statecraft (1513) by Niccolò Machiavelli.
quince — either of two small trees, Cydonia oblonga or C. sinensis, of the rose family, bearing hard, fragrant, yellowish fruit used chiefly for making jelly or preserves.
rinse — to wash lightly, as by pouring water into or over or by dipping in water: to rinse a cup.
since — from then till now (often preceded by ever): He was elected in 1978 and has been president ever since.
convince — If someone or something convinces you of something, they make you believe that it is true or that it exists.
crown prince — A Crown Prince is a prince who will be king of his country when the present king or queen dies.
Three-syllable rhymes
port-au-prince — Formerly Hayti. a republic in the West Indies occupying the W part of the island of Hispaniola. 10,714 sq. mi. (27,750 sq. km). Capital: Port-au-Prince.
Four-or-more syllable rhymes
flowering quince — any shrub belonging to the genus Chaenomeles, of the rose family, native to eastern Asia, having showy, waxy flowers and a quincelike fruit, grown widely as an ornamental.
japanese quince — a flowering quince, Chaenomeles speciosa, of Japan, having scarlet flowers and pear-shaped fruit.