Solutions :

3-letter words (1 point): 41

BET; BOH; BOO; BOR; BOS; BOT; HOB; HOO; HOS; HOT; OBE; OBO; OHO; OHS; OOH; OOR; OOS; OOT; ORS; ORT; OUR; OUS; OUT; ROB; ROO; ROT; RUE; RUT; SOB; SOH; SOT; SOU; SUE; SUR; TET; TOO; TOR; TOT; TUT; UTE; VET.

4-letter words (1 point): 67

BOHO; BOHS; BOOH; BOOR; BOOS; BOOT; BORS; BORT; BOSH; BOTS; BOTT; BOUT; EURO; GROT; GRUE; HOBO; HOOT; HORS; HOST; HOTE; HOTS; HOUR; HOUT; OBOS; OHOS; OOHS; OOTS; ORTS; OTTO; OURS; OUST; ROBE; ROOS; ROOT; ROST; ROTE; ROTO; ROTS; ROUE; ROUT; RUST; SHOO; SHOT; SOHO; SOOT; SORT; SOTS; SOUR; SOUS; SOUT; STOB; STOT; SUET; TOHO; TOOT; TORO; TORS; TORT; TOSH; TOST; TOTE; TOTS; TOUR; TOUT; TROT; TRUE; VETO.

5-letter words (2 points): 56

BOHOS; BOOHS; BOORS; BOOST; BOOTS; BORTS; BOTTE; BOURG; EUROS; GROTS; GROUT; HOBOS; HOOTS; HORST; HOSTS; HOURS; OTTOS; OUSTS; OUTRO; ROBOT; ROOST; ROSTS; ROTOS; ROTTE; ROUST; ROUTE; RUSTS; SHOOT; SHORT; SHOTE; SHOTS; SHOTT; SHOUT; SOOTE; SOOTS; SORTS; SORUS; SOURS; STOTT; STOUR; STOUT; STRUT; SUTOR; TOHOS; TOOTS; TOROS; TOROT; TORSO; TORTE; TORTS; TORUS; TOURS; TROTS; TROUT; TRUST; TUTOR.

6-letter words (3 points): 19

BETTOR; BOOSTS; BOURGS; GROTTO; HOOROO; HORSTS; OUTROS; ROOSTS; ROUSTS; SHOOTS; SHORTS; SHOTTE; STOURS; STROBE; STROUT; SUTORS; TOROUS; TRUSTS; TUTORS.

7-letter words (7 points): 4

BETTORS; GROTTOS; OUTROOT; OUTTROT.

8-letter word (11 points): 1

OUTTROTS.