Solutions :

3-letter words (1 point): 46

BID; BIS; BIT; BIZ; DEG; DEI; DIB; DIE; DIS; DIT; DUE; DUG; DUI; EST; GED; GET; GIE; GIS; GIT; GUE; GUS; GUT; IDS; ISM; ITS; SED; SEG; SEI; SET; SIB; SIT; SUD; SUE; SUI; TED; TEG; TES; TID; TIE; TIG; TIS; TUG; TUI; USE; UTE; ZIT.

4-letter words (1 point): 53

BIDI; BIDS; BISE; BIST; BITE; DEID; DESI; DEUS; DIED; DIES; DIET; DITE; DITZ; DUES; DUET; DUIT; DUST; EDGE; EGIS; ETUI; EUGE; GEIT; GEST; GETS; GIED; GIES; GISM; GIST; GITE; GITS; GUDE; GUES; GUID; GUST; IBIS; ISIT; SITE; SITZ; STED; STIE; SUED; SUET; SUID; SUIT; TEGU; TIDS; TIED; TIES; TIGE; TUIS; USED; UTIS; ZITE.

5-letter words (2 points): 27

BIDIS; DEIDS; DEISM; DEIST; DIETS; DITED; DUETS; EDGES; ETUDE; ETUIS; GEIST; GEITS; GITES; GUDES; GUEST; GUIDS; GUISE; SEGUE; SITED; STEDE; STIED; SUEDE; SUITE; TEGUS; TEIID; TIGES; TUISM.

6-letter words (3 points): 10

DEGUST; DUGITE; DUTIES; ETUDES; GUISED; GUSTED; GUSTIE; SEGUED; SUITED; TEIIDS.

7-letter words (7 points): 2

DUGITES; EDGIEST.