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)

• colics
• colies
• coliform
• coliform bacillus
• coliforms
• colin
• colins
• coliseum
• coliseums
• colitis
• colitises
• coll
• coll.
• collaborate
• collaborated
• collaborates
• collaborating
• collaboration
• collaborationism
• collaborationist
• collaborationists
• collaborations
• collaborative
• collaboratively
• collaborator