humdinger /hum-dingˈər/ (slang)

1. An exceptionally excellent person or thing
2. A smooth-running engine
3. A swift vehicle or aircraft

• double majority
• double-manned
• double-meaning
• double-minded
• double-mindedness
• double-mouthed
• double-natured
• double negation
• double negative
• double negatives
• doubleness
• doublenesses
• double obelisk
• double obelisks
• double obelus
• double or quits
• double-or-quits
• double-page spread
• double-page spreads
• double-park
• double-parked
• double-parking
• double-parks
• double play
• double plays