humdinger /hum-dingˈər/ (slang)

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

• unisonous
• unisons
• unit
• Unit.
• UNITA
• unital
• unitard
• unitards
• Unitarian
• Unitarianism
• Unitarians
• unitary
• unitary taxation
• unit cell
• unit cells
• unit cost
• unit costs
• unite
• united
• United Brethren
• United Free Church
• United Irishmen
• United Kingdom
• United Kingdom of Great Britain and Ireland
• United Kingdom of Great Britain and Northern Ireland