Solutions :

3-letter words (1 point): 42

AIA; AIN; AIR; AND; ANE; ANI; ARE; BED; BEE; BEG; BEN; DEB; DEE; DEI; DEN; EAN; EAR; EEN; END; ENE; ENG; ERA; ERE; ERN; ERR; GEN; IRE; NAE; NEB; NED; NEE; NEG; NIE; RAI; RAN; REB; RED; REE; REI; REN; RIA; RIN.

4-letter words (1 point): 50

AINE; AIRN; ARIA; BEAN; BEAR; BEDE; BEEN; BEER; BEIN; BEND; BENE; BENI; BERE; DEBE; DEEN; DEER; DENE; DENI; DERE; DERN; DREE; EINA; EINE; ERED; ERNE; GEAN; GEAR; GENA; GENE; GNAR; IRED; NARE; NEAR; NEED; NENE; NERD; NIED; RAIA; RAIN; RAND; RANG; RANI; REDE; REED; REEN; REIN; REND; RIND; RINE; RING.

5-letter words (2 points): 27

AINEE; AIRED; AIRER; ARENE; ARERE; BEARE; BEING; DEERE; DENAR; DRERE; EANED; EERIE; ENDER; ERING; ERNED; ERRED; GEARE; GENIE; GENRE; GNARR; IRING; NAIRA; NARRE; RAINE; RANEE; RANGE; RERAN.

6-letter words (3 points): 23

AIRIER; AIRNED; BEANED; BEANIE; BEARER; BENDEE; BENDER; DEEING; DENARI; DENIER; DERING; EARING; EERIER; ENRING; ERRAND; ERRING; GENDER; INDENE; NEARER; NERINE; RAINED; REINED; RENDER.

7-letter words (7 points): 7

ARRIERE; BEARING; BEERIER; DERNIER; DREEING; EARRING; GNARRED.

8-letter words (11 points): 2

REINDEER; RENDERER.