-ium /-i-əm/

1. Forming nouns denoting: a metallic element, as in plutonium
2. A group forming a positive ion, as in ammonium
3. A biological structure, as in conidium

• double-page spread
• double-page spreads
• double-park
• double-parked
• double-parking
• double-parks
• double play
• double plays
• double pneumonia
• double procession
• double-quick
• doubler
• double reed
• double reeds
• double refraction
• double rollover
• doublers
• doubles
• double salt
• double salts
• double saucepan
• double saucepans
• double-shade
• double-shaded
• double-shades