interplay /inˈtər-plā/

1. Mutual action
2. Interchange of action and reaction

• black papers
• black pepper
• blackpoll
• blackpolls
• Black Pope
• black powder
• Black Power
• black pudding
• black puddings
• black quahog
• black-quarter
• black rat
• black rats
• black rhinoceros
• black rhinoceroses
• black robin
• black robins
• Black Rod
• black rot
• Black Russian
• blacks
• black salsify
• black sheep
• Black Shirt
• Blackshirt