Solutions :

3-letter words (1 point): 51

AMU; AXE; DAE; DAM; DAS; DEL; DEN; DEX; EAS; EAU; ELD; ELL; ELS; EMS; EMU; END; ENS; ERE; ERR; LEA; LED; LES; LEX; MAD; MAE; MAS; MAX; MED; MEL; MES; MUS; MUX; NED; RED; REM; REN; RES; REX; SAD; SAE; SAM; SAU; SAX; SEA; SED; SEL; SER; SEX; SMA; SUM; SUS.

4-letter words (1 point): 55

AMUS; AXED; AXEL; AXES; DAES; DAME; DAMS; DELL; DELS; DENS; DERE; EAUS; EAUX; ELLS; EMUS; ERED; ERES; EXAM; EXED; EXES; LEAD; LEAM; LEAS; LERE; MADE; MAES; MASE; MASU; MEAD; MELD; MELL; MELS; MERE; MERL; MESA; NERD; READ; REAM; REDE; REMS; REND; RENS; SADE; SAME; SAMS; SAXE; SEAM; SEAS; SELD; SELL; SERE; SERR; SLED; SNED; SUMS.

5-letter words (2 points): 45

AXELS; DAMES; DELLS; DERES; DEXES; DREAM; DRERE; EDEMA; ELDER; ENDER; ERRED; EXAMS; LEAMS; LERED; MADRE; MASED; MASER; MASUS; MAXED; MAXES; MELLS; MERDE; MERED; MERER; MERLS; MESAS; MUXED; MUXES; NEXUS; REAMS; REDES; REXES; SADES; SAMEL; SAMES; SASER; SAXES; SEAMS; SEDER; SERED; SERER; SERRE; SEXED; SEXER; SMELL.

6-letter words (3 points): 14

DAMSEL; DREAMS; DRERES; EDEMAS; LEADEN; LEADER; MADRES; MELDER; READER; REMADE; RENDER; REREAD; SERRED; SMELLS.

7-letter words (7 points): 2

LEADENS; REDREAM.

8-letter word (11 points): 1

REDREAMS.