duffer¹ /dufˈər/

1. An unskilful or worthless person (informal)
2. A fogey, a useless old fellow (informal)
3. A counterfeit coin
4. An unproductive mine

• oil of mirbane
• oil of rhodium
• oil of thyme
• oil of turpentine
• oil of vitriol
• oil of wintergreen
• oil paint
• oil painting
• oil paintings
• oil paints
• oil palm
• oil palms
• oil pan
• oil pans
• oil paper
• oil platform
• oil platforms
• oil press
• oil presses
• oil-rich
• oil rig
• oil rigs
• oils
• oil sand
• oilseed