1. Thistle of western North America having white woolly leaves
   - woolly thistle

Type of: plume thistle, plumed thistle

• silently
• silents
• silenus
• silesia
• silex
• silhouette
• silica
• silica gel
• silicate
• siliceous
• silicic
• silicic acid
• silicide
• silicification
• silicify
• silicious
• silicle
• silicon
• silicon bronze
• silicon carbide
• silicon chip
• silicon dioxide
• silicon oxide
• Silicon Valley
• silicone