Solutions :

3-letter words (1 point): 39

AID; AIS; AIT; DIS; DIT; DSO; DUI; ENS; EST; FLU; FUD; IDS; IOS; ISO; ITS; JUD; JUS; JUT; LUD; NET; OSE; SAI; SEN; SET; SIS; SIT; SOS; SOT; SUD; SUI; SUS; TEN; TES; TID; TIS; TUI; UDS; UTE; UTS.

4-letter words (1 point): 49

AIDS; AITS; AITU; DISA; DISC; DITE; DITS; DSOS; DUIT; DUST; ESTS; ETUI; FLUS; FUDS; FUSC; FUST; ISOS; JUDS; JUST; JUTE; JUTS; LUDS; LUIT; LUST; LUTE; NEST; NETS; SAID; SAIS; SENS; SENT; SETS; SIST; SITE; SITS; SOTS; STEN; STOA; STUD; SUDS; SUID; SUIT; TENS; TIDS; TOSA; TOSE; TUIS; UTES; UTIS.

5-letter words (2 points): 31

AITUS; DITES; DUITS; DUSTS; ENTIA; ETUIS; FLUID; FLUTE; FUSTS; JUSTS; JUTES; LUSTS; LUTES; NESTS; OASIS; OSTIA; SAIST; SENSI; SENTI; SENTS; SISTS; SITES; SITUS; STENS; STOAI; STOAS; STUDS; SUIDS; SUITE; SUITS; TOISE.

6-letter words (3 points): 8

AIDFUL; FLUIDS; FLUTES; LUITEN; LUTIST; SENSIS; STUDIO; SUITES.

7-letter words (7 points): 3

DISNEST; FLUTIST; STUDIOS.