BET
BETOOK
BLUR
BOIL
BOO
BOOK
BOOR
BOOT
BORE
BOUT
BRO
BROOK
BRR
BUG
BUR
BURG
BUT
COB
COO
COOK
COOL
CORE
CORK
COT
COTE
ERR
GRIT
GROUT
GRUB
GURU
GUT
ILK
LOB
LOBE
LOOT
LOOTER
LOUR
LOUT
OBOE
OIL
ORB
ORE
OUR
OUT
OUTER
REBOIL
REBOOT
REBUT
REC
RECOOK
RECTO
RETOOK
RETOOL
RIG
RIOT
RIOTER
RITE
ROB
ROBE
ROBOT
ROE
ROIL
ROOK
ROOT
ROOTER
ROT
ROTE
ROUT
ROUTE
ROUTER
RUB
RUBE
RUG
RUT
TIRO
TOE
TOO
TOOK
TOOL
TOR
TORE
TOUR
TUB
TUBE
TUBER
TUG