humdinger /hum-dingˈər/ (slang)

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

• self-sow
• self-sowed
• self-sowing
• self-sown
• self-sows
• self-standing
• self-starter
• self-starters
• self-sterile
• self-sterility
• self-studies
• self-study
• self-styled
• self-subdued
• self-substantial
• Sinic
• sinical
• sinicise
• sinicised
• sinicises
• sinicising
• Sinicism
• sinicize
• sinicized
• sinicizes