Solutions :

3-letter words (1 point): 54

AIN; AIT; ALE; ALT; ANI; ANT; ASS; ATE; ATT; DEL; ELD; ELT; ESS; EST; ETA; ITA; ITS; LAM; LAS; LAT; LED; LES; LET; MAL; MAN; MAS; MAT; MNA; NAM; NAS; NAT; NIT; QAT; SAI; SAL; SAM; SAN; SAT; SED; SEL; SET; SIS; SIT; SMA; TAI; TAM; TAN; TAS; TAT; TED; TEL; TES; TIN; TIS.

4-letter words (1 point): 66

ALES; ALTS; ANTI; ATES; DELT; DESI; ELAN; ELTS; ESTS; ETAS; ETAT; ITAS; LAIN; LAMS; LANT; LASE; LASS; LAST; LATE; LATI; LATS; LESS; LEST; LETS; MAIN; MALE; MALT; MANI; MASE; MASS; MAST; MATE; MATS; MATT; MNAS; NAMS; NATS; QATS; SAIN; SALE; SALT; SAMS; SANT; SATE; SATI; SELD; SESS; SETA; SETS; SETT; SISS; SIST; SITS; STAT; STED; TAIN; TAIT; TALE; TAMS; TASS; TATE; TATS; TELA; TELD; TELT; TEST.

5-letter words (2 points): 47

ASSET; DELTA; DELTS; ELAIN; ETTIN; ISTLE; LASED; LASES; LASSI; LASTS; LATED; LATTE; LESTS; MALES; MALTS; MASED; MASES; MASSE; MASTS; MATED; MATES; MATIN; MATTE; MATTS; NALED; NATES; SAINT; SALES; SALET; SALTS; SATED; SATES; SATIN; SETAL; SISAL; SISTS; SMALT; STAIN; STALE; STELA; TAINT; TALES; TANTI; TASSE; TASTE; TATES; TESTS.

6-letter words (3 points): 33

ATTEST; DELTAS; DESALT; DESIST; DETAIN; INMATE; ISATIN; ISTLES; LASTED; LATEST; LATTES; LATTIN; MALTED; MANTLE; MASSED; MASTED; MATTED; MATTES; MATTIN; SALETS; SALTED; SISTED; SMALTI; SMALTS; STALED; STALES; STATIN; STELAI; TASSEL; TASSET; TASTED; TASTES; TESTIS.

7-letter words (7 points): 12

ATTESTS; DESALTS; DESISTS; DESTAIN; INMATES; LATESTS; MANTLED; MANTLES; MANTLET; MATLESS; SALTEST; STALEST.

8-letter word (11 points): 1

MANTLETS.

9-letter word (11 points): 1

TAINTLESS.