Solutions :

3-letter words (1 point): 51

ACH; ACT; AMI; BEL; BET; BIS; BIT; CAM; CAN; CHI; CIS; ELS; ELT; ERS; EST; HIE; HIT; ICH; IRE; ISM; ITS; LEI; LET; LIE; LIT; MAC; MAN; MIC; MIR; MIS; MNA; NAM; REI; RES; RIB; RIM; RIT; SEI; SER; SIB; SIC; SIM; SIR; SIT; SMA; SRI; TEL; TIE; TIL; TIS; WIT.

4-letter words (1 point): 80

ACTS; AMIE; AMIR; AMIS; BELS; BELT; BETS; BISE; BIST; BITE; BITS; CAMS; CHIT; CIRE; CIST; ELHI; ELSE; ELTS; ERIC; ERST; ETCH; HILT; HITS; IRES; IRIS; ISIT; ISLE; ITCH; LEIR; LEIS; LETS; LITE; LITS; MACH; MACS; MICA; MICH; MICS; MIRE; MIRI; MIRS; MISE; MIST; NACH; NAMS; REIS; REST; RICH; RIEL; RIMA; RIMS; RISE; RITE; RITS; SCAM; SCAN; SEIR; SICH; SIMA; SIRE; SIRI; SITE; SLIT; SMIR; STIE; STIR; TEIL; TELS; TILE; TILS; TIRE; TRES; TRIE; TRIM; WHIT; WIEL; WILE; WILT; WITE; WITS.

5-letter words (2 points): 44

AMIES; AMIRS; ANCLE; BELCH; BELTS; BIRSE; BITCH; CAMIS; CHIEL; CHILE; CHITS; CIRES; ELCHI; ERICA; ERICS; HILTS; ISLET; ISTLE; LEIRS; LETCH; LITRE; MACHI; MACLE; MIRES; MISCH; MISER; REIST; RESIT; RIELS; SERIC; STEIL; STILE; STIRE; TEILS; TIRES; TRIBE; TRIES; TRIMS; WHILE; WHITE; WHITS; WIELS; WILTS; WITCH.

6-letter words (3 points): 16

BETISE; BETRIM; BIRSLE; BISTRE; BITSER; CAMISE; CHIELS; ELTCHI; LITRES; MIRITI; MISLIE; MISLIT; MISTLE; RESITE; STRICH; WHILST.

7-letter words (7 points): 5

BETRIMS; BITSIER; ELITISM; ESTRICH; TRISMIC.