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

• frowned
• frowning
• frowningly
• frown on
• frowns
• frown upon
• frows
• frowsier
• frowsiest
• frowsiness
• ivy-tods
• IW
• I-way
• IWC
• iwi
• I will be along
• iwis
• I wouldn't be seen dead
• I wouldn't know
• IWW
• ixia
• ixias
• ixodiases
• ixodiasis
• ixtle