luffer-board /lufˈər-bōrd or -börd/ same as louvre-board under louvre

• dumb-cluck
• dumb-clucks
• dumb down
• dumbed
• dumber
• dumbest
• dumbfound
• dumbfounded
• dumbfounder
• dumbfoundered
• dumbfoundering
• dumbfounders
• dumbfounding
• dumbfounds
• dumbing
• dumbing-down
• dumbledore
• dumbledores
• dumbly
• dumbness
• dumbnesses
• dumbo
• dumbos
• green manure
• green manuring