Solutions :

3-letter words (1 point): 53

AFT; AMU; EFT; ELF; ELM; ELT; EMO; EMU; ERF; EST; FAX; FEM; FER; FES; FET; FRO; IRE; ITS; LEI; LES; LET; MAX; MEL; MES; MET; MOR; MOU; ORE; ORF; OUR; QIS; REF; REI; REM; RES; RET; RIT; ROM; RUM; SEI; SEL; SER; SET; SIR; SIT; TEF; TEL; TES; TIE; TIS; UMU; URE; VOR.

4-letter words (1 point): 59

AFRO; AXLE; EFTS; ELTS; FAME; FAUR; FEIS; FELT; FERM; FEST; FETS; FRET; FRIS; FRIT; FROM; IRES; ITEM; LEFT; LEIR; LEIS; LEST; LETS; MELT; MERI; METS; MORE; MURE; OMER; ORES; ORFE; OUMA; REFT; REIS; REST; RETS; RIEL; RIEM; RISE; RITE; RITS; ROMA; ROUM; RUME; SEIR; SELF; SERF; SIRE; SITE; STEM; STIE; STIR; TERF; TERM; TIER; TIES; TIRE; TIRO; URES; VROU.

5-letter words (2 points): 43

AFRIT; AFTER; AMOUR; AMRIT; AUREI; AURES; AURIS; AXLES; FAMES; FEIST; FELTS; FEMUR; FREIT; FRETS; FRIES; FRISE; FRIST; FRITS; ISTLE; LEFTS; LEMUR; MAURI; MELTS; MERIS; MERIT; METIS; MOREL; MORES; MURES; ORFES; ORIEL; OURIE; QORMA; REIST; RESIT; RITES; RUMES; SERUM; SERVO; STIRE; TIRES; URITE; VOMER.

6-letter words (3 points): 12

AFRITS; AMORET; AMRITS; AURIST; FREITS; FRITES; ITERUM; ITSELF; MAFTIR; MAURIS; MERITS; URITES.

7-letter words (7 points): 4

AMORETS; AMORIST; FAUREST; OURIEST.