abacus /abˈə-kəs/

1. A counting frame, consisting of horizontal rods along which movable beads can be slid
2. A level tablet on the capital of a column, supporting the entablature (architecture)

• crabs
• crab's-eyes
• crab-sidle
• crab-sidled
• crab-sidles
• crab-sidling
• crab stick
• crabstick
• crab sticks
• crabsticks
• crab-stones
• crab tree
• crab trees
• crabwise
• crab-wood
• crab-yaws
• crachach
• crack
• crack a bottle
• crack a can
• crack a crib
• crackajack
• crackajacks
• crack a joke
• crack a smile