silphium /silˈfi-əm/

1. A plant (perh the umbelliferous Ferula tingitana) imported from Cyrenaica by the Greeks for use as a food and in medicine (historical)
2. (cap) a genus of American composites, compass plants

• water fern
• water ferns
• water-finder
• water-finders
• water flag
• water flags
• water flea
• water fleas
• water flies
• water flood
• waterflood
• waterflooding
• water floods
• water flow
• water flowers
• water-flowing
• water flows
• water fly
• waterfowl
• waterfowls
• water frame
• water frames
• waterfront
• waterfronts
• water gage