Solutions :

3-letter words (1 point): 33

AIN; AIS; ANI; ANN; ASS; BIN; BIO; BIS; BIZ; COS; GNU; GUN; INN; IOS; ISM; ISO; MOA; MOC; MOI; MOS; NAN; NAS; NIB; NIS; OMS; SAI; SAN; SIB; SIN; SOC; SOM; UNI; ZIN.

4-letter words (1 point): 24

ANIS; BIAS; BING; BIOS; COIN; COMB; COMS; COSS; ISMS; MOAI; MOAN; MOAS; MOCS; MOSS; NAIN; NAOI; NAOS; NIBS; SAIN; SIBS; SING; SOMS; UNIS; ZING.

5-letter words (2 points): 2

COMBI; COMBS.

6-letter words (3 points): 5

COMBIS; COSING; MOSING; NANISM; SANING.

7-letter words (7 points): 3

COMBING; MOANING; NANISMS.