ruff² /ruf/

1. An old card game similar to whist or trumps (also called ruff and honours)
2. An act of trumping

To trump

• costeans
• costed
• cost-effective
• cost-effectiveness
• cost efficiency
• cost-efficient
• coster
• costermonger
• costermongers
• costers
• costes
• cost-free
• costing
• costive
• costively
• costiveness
• costivenesses
• costlier
• costliest
• costliness
• costlinesses
• costly
• costmaries
• costmary
• cost of living