(Italian, Portuguese, Spanish and Galician) word originally derived from Latin "Castrum", a Roman military camp or fortification (cf: Greek: kastron; Proto-Celtic: *Kassrik; ).n. Wikipedia suggests castro . Castro contains 6 letters and has 235 connections / rhymes. 496 Calmero Calmero contains 7 letters and has 496 connections / rhymes. 401 Chiaroscuro