Solutions :

3-letter words (1 point): 40

DEE; DEV; DUE; DUI; ERE; ERF; ERR; EVE; EVO; FIR; FOE; FOR; FRO; FUD; FUR; IRE; JEE; JOE; JOR; ORD; ORE; ORF; PED; PEE; PER; RED; REE; REO; REP; REV; RIF; ROE; RUD; RUE; UFO; URD; URE; VEE; VOE; VOR.

4-letter words (1 point): 38

DEER; DEEV; DERE; DERO; DREE; DURE; DURO; DURR; ERED; EREV; EURO; EVER; EVOE; FIRE; FORD; FORE; FREE; FROE; FURR; IRED; IURE; JEED; JEEP; JEER; OVER; PEER; PERE; PERI; REED; ROED; RORE; ROVE; RUDE; RUED; URDE; VEEP; VEER; VERD.

5-letter words (2 points): 15

DEEVE; DERRO; DROVE; ERRED; FIRED; FREED; FRORE; FUERO; FUROR; PEDRO; PEEVE; PERDU; REEVE; ROVER; URDEE.

6-letter words (3 points): 9

DROVER; FURORE; JEERED; OVERED; PEEVER; REEVED; REVERE; VEERED; VORRED.

7-letter words (7 points): 4

FOREVER; OVERDUE; OVERRED; REVERED.

8-letter words (11 points): 2

OVERFREE; OVERRUDE.