Solutions :

3-letter words (1 point): 37

CIS; CUE; ECU; FEN; FES; FET; FEU; FUN; ICE; LUV; NEF; NET; NIS; NIT; NUS; NUT; QIS; RIN; RIT; SEC; SEN; SET; SIC; SIN; SUE; SUN; TEC; TEF; TEN; TES; TIN; TUI; TUN; UNI; USE; UTE; VET.

4-letter words (1 point): 38

CENT; CINE; CUES; CUNT; ECUS; ENUF; ETUI; FENI; FENT; FEUS; FUCI; FUSC; FUSE; ICES; INTI; LUIT; LUNE; LUNT; LUTE; NICE; NISI; NITE; RINE; RITE; SECT; SENT; SICE; SINE; SUET; TECS; TINE; TUNE; UNCE; UNCI; UNIS; UNIT; UTES; VENT.

5-letter words (2 points): 22

CENTU; CINES; FENIS; INCUS; LUNES; LUNET; LUTES; NITES; RINES; RITES; SCENT; SENTI; SINCE; SUENT; TINES; TUNES; TUNIC; UNCES; UNCUS; UNITE; UNTIN; VENUS.

6-letter words (3 points): 7

INCENT; INCISE; INCUSE; LUITEN; TUNICS; UNITES; UNTUNE.

7-letter word (7 points): 1

UNTUNES.