Solutions :

3-letter words (1 point): 43

ADS; AND; ANE; ANI; ANN; BED; BEE; BEN; DAE; DAN; DAS; DEB; DEE; DEI; DEN; DIE; DIN; DSO; EAN; EAS; EDS; EEN; END; ENE; IDE; IDS; INN; NAE; NAN; NAS; NEB; NED; NEE; NID; NIE; OSE; SAD; SAE; SAN; SEA; SED; SEI; SEN.

4-letter words (1 point): 41

ANDS; BEDE; BEDS; BEEN; BEIN; BEND; BENE; BENI; DAES; DEAN; DEBE; DEEN; DENE; DENI; DIEB; DIES; DINE; EIDE; EINA; EINE; ENDS; IDEA; IDEE; IDES; NADS; NANE; NAOS; NEDS; NEED; NIDE; NIDS; NIED; NIES; NINE; QADI; SADE; SADI; SAND; SANE; SEAN; SEND.

5-letter words (2 points): 19

BEDES; BEEDI; BENDS; BENNI; DIENE; DINES; DINNA; EANED; IDEAS; INANE; INDIE; INNED; NEEDS; NIDES; NINES; SANED; SDEIN; SEDAN; SEINE.

6-letter words (3 points): 9

AEDINE; DENIES; INDENE; INDIES; NANDIN; NANNIE; SANNIE; SEANED; SEINED.

7-letter words (7 points): 7

ADENINE; BEEDIES; DANNIES; NANDINE; NANNIED; NANNIES; NINNIES.

8-letter words (11 points): 2

ADENINES; NANDINES.