-opsis /-op-sis/

1. Denoting appearance of, or resemblance to, the thing specified, as in meconopsis
2. Sight, as in stereopsis

• ball-bearings
• ball-boy
• ball-boys
• ball-breaker
• ball-breakers
• ball-breaking
• ball-buster
• ball-busters
• ball-busting
• ball cartridge
• ballclay
• ballclays
• ballcock
• ballcocks
• ball-dress
• ball-dresses
• balled
• balled-up
• ballerina
• ballerinas
• ballerine
• ballet
• ballet-dancer
• ballet-dancers
• ballet-dancing