Solutions :

3-letter words (1 point): 44

APE; ASK; ASP; AVE; DIE; DIF; DIS; EAS; EFS; EIK; EKE; FES; FID; FIE; FIR; IFS; IRK; KEA; KEF; KEP; KID; KIF; KIR; KIS; PAS; PAV; PEA; PES; PSI; RID; RIF; SAE; SAP; SAV; SEA; SEI; SIF; SIK; SIR; SIS; SKI; SPA; VAE; VAS.

4-letter words (1 point): 58

APES; APSE; AVES; DIES; DIFS; DIKE; DIRK; DISA; DISK; EASE; EAVE; EIKS; EKES; ESES; FEIS; FIKE; FIRK; FISK; IRID; IRIS; IRKS; KEAS; KEFS; KEIR; KEPS; KIEF; KIFS; KRIS; PASE; PAVE; PAVS; PEAS; PEKE; PSIS; RIFE; RIFS; RISE; RISK; RISP; SAVE; SAVS; SEAS; SEIF; SEIK; SEIR; SEIS; SEPS; SESE; SIES; SIKE; SIRI; SKEP; SKID; SKIS; SPAE; SPEK; VAES; VASE.

5-letter words (2 points): 33

AESIR; APSES; APSIS; DIKES; DIRKE; DIRKS; EASES; EAVES; FEASE; FIKES; FIRIE; FIRKS; KEFIR; KIEFS; PASES; PAVES; PEASE; PEISE; PEKES; RISES; SAVES; SEASE; SEIFS; SEISE; SIKES; SIRIS; SKEPS; SKIES; SPAES; SPEIR; SPEKS; VASES; VESPA.

6-letter words (3 points): 11

DIRKES; EASIES; ESKIES; FEIRIE; FIRIES; IRISES; KRISES; PEASES; PEISES; SKRIES; SPEISE.

7-letter word (7 points): 1

DISEASE.