nicker⁴ /nikˈər/

1. A clay marble (also knicker)
2. The round seed of a Caesalpinia (or Guilandina if this is considered a separate genus), used for playing marbles (also nickˈar)

• groundling
• groundlings
• ground loop
• ground loops
• ground mail
• groundman
• groundmass
• groundmasses
• groundmen
• ground moraine
• groundnut
• groundnuts
• ground oak
• ground oaks
• ground-officer
• ground-officers
• ground-pigeon
• ground pine
• ground pines
• ground plan
• ground plans
• ground plate
• ground plates
• groundplot
• groundplots