Solutions :

3-letter words (1 point): 45

CEE; CEL; COL; COP; COT; ECO; EEL; EEN; ELT; ENE; EVO; JEE; JET; JOE; JOL; JOT; LEE; LET; LEV; LOP; LOT; NEE; NET; OLE; OPT; POL; POT; REC; REE; REN; REO; RET; REV; TEC; TEE; TEL; TEN; TOC; TOE; TOP; TOT; VEE; VET; VOE; VOL.

4-letter words (1 point): 50

CETE; COLE; COLT; COTE; COTT; COVE; ETEN; EVOE; JEEL; JEER; JETE; JOLE; JOLT; LEER; LEET; LEVO; LOTE; LOTO; LOVE; NENE; NETE; NETT; OLEO; OTTO; OVEL; OVEN; OVER; POET; POLE; POLO; POLT; POTE; POTT; REEL; REEN; RETE; TEEL; TEEN; TEER; TELE; TELT; TENE; TOLE; TOLT; TOTE; VELE; VETO; VOLE; VOLT; VOTE.

5-letter words (2 points): 20

COVEN; COVER; COVET; ELECT; ELVER; ETTLE; LOTTE; LOTTO; LOVER; NETOP; OTTER; POTTO; RECTO; RELET; RENNE; TENNE; TOTER; VOLET; VOLTE; VOTER.

6-letter words (3 points): 18

COLTER; COTTER; JENNET; JOLTER; LEETLE; LOTTER; NETTLE; POTEEN; POTTER; POTTLE; RENNET; REVOLT; REVOTE; TENNER; TOETOE; TOLTER; VENNEL; VOTEEN.

7-letter words (7 points): 3

COVELET; OVERLET; POTTEEN.

8-letter word (11 points): 1

COVERLET.