doppelgänger /dopˈl-gengˈər/ or doppelganger /-gangˈ/

1. A ghostly double of a human person, an apparition
2. A wraith

• fourfoldnesses
• four-foot
• four-footed
• four-foot way
• four-function calculator
• four-function calculators
• fourgon
• fourgons
• four-handed
• four-horse
• four-hours
• Fourier analysis
• Fourierism
• Fourierist
• Fourieristic
• Fourier principle
• Fourier series
• four-inched
• four-in-hand
• fou rire
• four-leaf
• four-leaf clover
• four-leafed
• four-leaved
• four-legged