- bur
- bus
- bul
- bod
- bed
- dub
- due
- dog
- doe
- dour
4-letter words:
- bold
- doze
- door
- robe
- rule
- lure
5-letter words:
- labor
- lobed
- model
- noble
- robed
- rebel
- ruble
6-letter words:
- border
- brodel
- double
- ordeal
- reload
7-letter words:
- reboodle
- redouble
11-letter word:
- boustrophedon