Solutions :

3-letter words (1 point): 52

ADS; AND; ANE; ANT; BED; BEL; BET; BIT; BUR; BUS; BUT; DAE; DAN; DEB; DEI; DEL; DEN; DEX; EAN; EDS; ELT; END; ENS; LED; LEI; LET; LEU; LEX; LIB; LIE; LIT; NAE; NED; NET; RUB; RUE; RUT; SUB; SUE; SUR; TEA; TED; TEL; TEN; TET; TEX; TIE; TIL; TIX; TUB; UTE; UTS.

4-letter words (1 point): 66

ANDS; ANTE; ANTS; BEDE; BEDS; BELT; BETE; BETS; BILE; BITE; BITT; BURS; BUST; BUTE; BUTS; BUTT; DANS; DANT; DEAN; DEBT; DEIL; DELE; DELI; DELT; DENS; DENT; DEUS; EANS; ENDS; ETEN; ETNA; EXIT; IBEX; ILEX; LETS; LIED; LIEU; LITE; NADS; NEDS; NETE; NETT; RUBE; RUED; RUST; RUTS; SNED; STED; STET; STUB; SUED; SUET; TEAD; TEDS; TEIL; TELE; TELT; TEND; TENS; TENT; TETE; TETS; TIED; TILE; TRUE; TUBE.

5-letter words (2 points): 39

ANTED; BETED; BETEL; BILED; BITTE; BITTS; BURST; BUTTE; DANTS; DEANS; DEBIT; DEBTS; DEBUS; DEBUT; DENTS; ELITE; ENSUE; ETENS; ETTLE; EXILE; ILEUS; LIEUS; LITED; NETTS; RUBEL; SNEAD; STEDE; STEIL; STELE; SUEDE; TEADE; TEADS; TELEX; TENDS; TENTS; TILED; TRUED; TUBED; USNEA.

6-letter words (3 points): 23

BELTED; BETTED; BITTED; BITTUR; BUSTED; BUTTED; BUTTLE; DEBILE; DEBUTS; DELETE; DENTEL; DENTEX; DETENT; ENSUED; ENTETE; EXITED; LETTED; NETTED; RUBIED; RUSTED; RUTTED; SUTTLE; TENTED.

7-letter words (7 points): 6

BITTURS; BURSTED; BUTTLED; DETENTS; NEDETTE; SUTTLED.