Solutions :

3-letter words (1 point): 54

BUD; BUR; BUS; BUY; DUB; DUO; EMO; ERR; ERS; FOG; FOR; FOU; FOY; GOR; GOT; GOY; GUS; GUV; GUY; MOG; MOR; MOT; MOU; MOY; OFT; ORE; ORS; ORT; OUD; OUR; OUS; OYS; REM; ROM; ROT; RUB; RUD; SUB; SUD; SUR; SUS; TOG; TOM; TOR; TOY; TRY; UDS; URE; VUG; YGO; YOM; YOU; YUG; YUS.

4-letter words (1 point): 56

BUDS; BUOY; BURR; BURS; BURY; BUSY; BUYS; DUBS; DURE; DURO; DURR; ERRS; FOGY; FORE; FORM; FORT; FOUD; FOUR; FOUS; FOYS; GORE; GORM; GORY; GOYS; GUVS; GUYS; GYRE; GYRO; MORE; MORS; MORT; MOUS; MOYS; OMER; OUDS; OURS; RUBS; RUDS; RYOT; SUBS; SUDS; SURE; SUSU; TOME; TORE; TORR; TORS; TORY; TOUR; TOYS; TROG; TROY; YORE; YOUR; YOUS; YURT.

5-letter words (2 points): 29

BUOYS; BURRO; BURRS; BURRY; DUROY; DURRS; DURRY; FORME; FOUDS; FOURS; GOMER; GUYOT; GYRUS; MERRY; MOUSY; OMERS; ORMER; ROGUY; SUDSY; SURER; TORRS; TORUS; TOURS; TOUSY; TROYS; USURE; USURY; YOURS; YOURT.

6-letter words (3 points): 8

DUROYS; FORMER; GOMERS; GYROUS; ORMERS; REMOUD; TOURER; USURER.

7-letter words (7 points): 4

FORMERS; MORSURE; TOURERS; USURERS.