Solutions :

3-letter words (1 point): 37

AMU; CON; COS; COT; CUM; CUT; INS; MAT; MUT; NIS; NOS; NOT; NUS; NUT; ONS; OUS; OUT; SIN; SOC; SON; SOT; SOU; SUI; SUN; TAM; TAU; TOC; TON; TOT; TUI; TUM; TUN; UNI; UNS; UTA; UTU; ZIN.

4-letter words (1 point): 44

ATOC; AUNT; AUTO; CONI; CONS; COST; COTS; INTO; MAUN; MAUT; MUON; NOTA; NOUS; NOUT; OCTA; ONST; ONUS; OUMA; OUST; SCOT; SCUM; SCUT; SINS; SNOT; SONS; SOTS; SOUM; SOUS; SOUT; STOT; SUNS; TAUS; TOCS; TONS; TOST; TOTS; TOUN; TOUT; TUIS; TUNS; UNIS; UNTO; UTUS; ZINS.

5-letter words (2 points): 27

ATOCS; AUNTS; AUTOS; CONUS; COSTS; COUNT; INUST; MAZUT; MUCUS; MUONS; MUTON; NIZAM; NOTUM; OUSTS; SCOTS; SCOUT; SCUTA; SNOTS; SNOUT; SOUCT; STOUN; STOUT; SUINT; TAUNT; TAUON; TONUS; TOUNS.

6-letter words (3 points): 10

COUNTS; COUSIN; COUZIN; MUCOUS; MUTONS; NOCTUA; STOUNS; SUINTS; TAUNTS; TAUONS.

7-letter words (7 points): 3

COUSINS; COUZINS; SINUOUS.