Solutions :

3-letter words (1 point): 55

EEL; EEN; ELL; ELS; ENE; ENG; GEE; GEL; GEN; GEO; GNU; ILL; IOS; ISO; LEE; LEG; LEI; LEP; LEU; LIE; LIS; LOO; LOP; LOR; LOS; NEE; NEG; NEP; NUN; NUR; OIL; OLE; OOP; OOR; OOS; OPE; PEE; PEG; PEN; POI; POL; POO; POS; PRO; PUN; PUR; ROE; ROO; RUE; RUN; SOL; SOP; UPO; URN; URP.

4-letter words (1 point): 63

EELS; ELLS; EPOS; EURO; GEEP; GELS; GENE; GENU; GEOS; GLEE; GLEI; GLEN; GLOP; ILLS; ISLE; LEIS; LENG; LILO; LOOP; LOOR; LOOS; LOPE; LORN; NEEP; OILS; OLPE; OPEN; PEEN; PELE; PELL; PENE; PLIE; POIS; POLE; POLL; POLS; POOL; POOR; POOS; PORN; PROO; PROS; PUNG; ROIL; ROLE; ROLL; ROOP; ROOS; ROPE; RUNE; RUNG; SILE; SILL; SILO; SLEE; SLOE; SLOP; SOIL; SOLE; SOLI; SOOL; SOOP; SORN.

5-letter words (2 points): 27

ELOPE; ELPEE; EUROS; GLEIS; GLOOP; LILOS; LISLE; NEELE; NELIS; OLLIE; PELLS; POLIS; POOLS; PROLE; PROLL; PROSO; PRUNE; ROILS; RUPEE; SILEN; SLOOP; SLOPE; SOLEI; SOOLE; SOPOR; UNPEG; UNPEN.

6-letter words (3 points): 14

LOOSIE; NELLIE; POLEIS; POLLEE; POLLEN; POSOLE; PROLEG; PUNGLE; RUELLE; SILENE; SOLGEL; UNROLL; UNROPE; UPROLL.

8-letter words (11 points): 2

PRUNELLE; PRUNELLO.

9-letter word (11 points): 1

PRUNELLOS.