4 letter words:
bold7,
burd7,
drub7,
blur6,
burl6,
dour5,
duro5,
lord5,
loud5,
lour4,
3 letter words:
bod6,
bud6,
dub6,
bro5,
bur5,
lob5,
orb5,
rob5,
rub5,
urb5,
dol4,
dor4,
duo4,
old4,
oud4,
rod4,
udo4,
urd4,
our3,
2 letter words:
bo4,
do3,
od3,
lo2,
or2,