Solutions :

3-letter words (1 point): 38

AIM; AIN; AIT; ANI; AUE; EST; ITS; LIN; LIT; MIL; MIS; MIZ; NIE; NIL; NIM; NIT; NUT; SEI; SET; SIM; SIT; TES; TIE; TIL; TIN; TIS; TIT; TUI; TUN; UNI; UTE; UTS; VIM; VIN; WIS; WIT; ZIN; ZIT.

4-letter words (1 point): 45

AITS; AITU; ANIL; EINA; ETUI; INIA; LITE; LITS; LITU; MILT; MINA; MINI; MISE; MIST; MITE; NIES; NITE; NITS; NUTS; SIMI; SITE; STIE; STIM; STUN; TIES; TILT; TITE; TITI; TITS; TUAN; TUNA; TWIT; UNAI; UNIT; UTES; UTIS; VINA; VITE; WISE; WIST; WITE; WITS; ZITE; ZITI; ZITS.

5-letter words (2 points): 17

ANIMI; LIMIT; LITES; MITES; MITIS; NITES; STEIN; STILT; TITIS; TUINA; TWIST; TWITE; TWITS; UNITE; UNITS; WITES; ZITIS.

6-letter words (3 points): 16

ANIMIS; LIMINA; LIMITS; MINUET; MINUTE; SEIZIN; SIMIAN; SIMLIN; STIMIE; TIMIST; TINIES; TITIAN; TWITES; UNITES; VIMINA; VIZIES.

7-letter words (7 points): 12

ANIMIST; LIMIEST; LIMITES; LINIEST; MINIEST; MINUETS; MINUTES; MINUTIA; TINIEST; UNITIES; UNITISE; VINIEST.