7 letter words
REORDER​8
ORDERER​8
5 letter words (8 words)
ORDER​6
ERROR​5
ERRED​6
ERODE​6
DOREE​6
DERRO​6
DREER​6
DRERE​6
4 letter words (14 words)
REED​5
DEER​5
RODE​5
REDO​5
ERED​5
DORE​5
REDE​5
DOER​5
DREE​5
DORR​5
DERE​5
ROED​5
DERO​5
RORE​4
3 letter words (13 words)
RED​4
ROD​4
DOE​4
DEE​4
ERR​3
ORE​3
ORD​4
ROE​3
ODE​4
ERE​3
DOR​4
REE​3
REO​3
2 letter words (9 words)
OR​2
DO​3
RE​2
DE​3
ED​3
EE​2
ER​2
OE​2
OD​3