Solutions :

3-letter words (1 point): 38

AFT; AIA; AIS; ASS; BAS; BAT; BEE; BIS; CEE; CUB; EAS; EAT; ECU; FAB; FAE; FAS; FAT; FAW; FUB; ICE; SAB; SAE; SAI; SAT; SAW; SIB; SIS; TAB; TAE; TAI; TAS; TAW; TWA; WAB; WAE; WAI; WAS; WAT.

4-letter words (1 point): 38

AIAS; BAFT; BASS; BAST; BATS; BEAT; BIAS; BICE; BIST; CEAS; CUBE; EAST; EATS; FAST; FATS; FAWS; FUCI; IBIS; SABE; SAFT; SAIS; SAWS; SIST; STAB; STAW; SWAB; SWAT; TABI; TABU; TAIS; TASS; TAWS; TWAE; TWAS; WAFT; WAIS; WAST; WATS.

5-letter words (2 points): 12

ABCEE; ASSAI; BAFTS; BASIS; BASSI; BEAST; BEATS; CEIBA; SAIST; TABIS; WAFTS; WAIST.

6-letter words (3 points): 4

CEIBAS; CUBIST; FATSIA; TASSIE.

7-letter word (7 points): 1

FATSIAS.