Solutions :

3-letter words (1 point): 55

DIG; DIS; DOG; DOS; DSO; ERG; ERS; ESS; GID; GIO; GIP; GIS; GOD; GOE; GOR; GOS; GUP; HOE; HOG; HOI; HOP; IDS; IOS; IRE; ISO; JOE; JOG; JOR; KOI; KOP; KOR; ODS; OES; ORE; ORS; PIG; PIU; POH; POI; PUG; REO; RES; REZ; RID; RIG; ROE; ROK; SER; SEZ; SIR; SIS; SOD; SOG; SRI; UPO.

4-letter words (1 point): 43

DIRE; DISS; DOSS; ERGO; GIDS; GIOS; GIRO; GODS; GOER; GOES; GORE; GORI; GOSS; GRID; GRIS; GROK; HOER; HOES; HORE; HORI; HORS; IRES; JESS; JOES; JORS; KHOR; KOIS; KORE; KORS; OGRE; ORES; POGO; POIS; PORE; RIDS; RISE; ROES; SERS; SIRE; SIRS; SRIS; UPGO; ZERO.

5-letter words (2 points): 21

ERGOS; GOERS; GORES; GORIS; GORSE; GOSSE; GRIDS; GRISE; HOERS; HOISE; HORIS; HORSE; JERID; KHORS; KORES; OGRES; POGOS; POISE; PORES; RESID; SIRES.

6-letter words (3 points): 8

DOSSER; IODISE; JERIDS; OGRESS; OPIOID; POISER; RESIDS; UPGOES.

7-letter words (7 points): 4

DIGRESS; IODISER; OPIOIDS; POISERS.

8-letter word (11 points): 1

IODISERS.