Clear this solution

Door
Doors
Dots
Dour
Duro
Dust
Odorous
Odour
Ours
Oust
Outdoor
Rods
Rood
Roost
Root
Rout
Rust
Soot
Sort
Sour
Stood
Stud
Surd
Todo
Toro
Torso
Torus
Tour
Tours
Trod
Tudor