1. Repeating the same thing in different words; tautological

Encyclopedia: Tautologous

• soliton
• soliton wave
• solitude
• solitudinarian
• solleret
• solmisation
• solmizate
• solmization
• solo
• solo blast
• solo homer
• Solo man
• soloist
• Solomon
• Solomon Bellow
• Solomon Guggenheim
• Solomon Hurok
• Solomon Islands
• Solomon's-seal
• Solomonic
• Solomons
• solon
• Solresol
• solstice
• solstitial