humdinger /hum-dingˈər/ (slang)

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

• ecosystem
• ecosystems
• ecoterrorism
• ecoterrorist
• ecoterrorists
• ecotone
• ecotones
• eco-tourism
• eco-tourist
• eco-tourists
• ecotoxic
• ecotoxicological
• ecotoxicologies
• ecotoxicologist
• ecotoxicologists
• ecotoxicology
• ecotype
• ecotypes
• eco-village
• ecowarrior
• ecowarriors
• ECOWAS
• ecphoneses
• ecphonesis
• ecphractic