Solutions :

3-letter words (1 point): 54

DEN; DIM; DIN; DIS; DOE; DOM; DON; DOS; EEN; EFF; END; ENE; EON; ERF; ERN; FEE; FEN; IDE; INN; ION; IOS; ISM; ISO; MID; MIS; MOD; MOE; MOI; MON; MOS; NED; NEE; NEF; NID; NIM; NIS; NOD; NOM; NON; NOS; ODE; OES; OMS; ONE; OSE; RED; REN; SEE; SEN; SIM; SIN; SOD; SOM; SON.

4-letter words (1 point): 47

DENE; DENI; DERN; DIMS; DINE; DINO; DOEN; DOES; DOMS; DONE; DOSE; ENES; ERNE; FEEN; FEES; MIND; MINE; MINO; MISE; MISO; MODE; MODI; MOES; MOSE; NENE; NEON; NERD; NIDE; NIMS; NODE; NODI; NOES; NOMS; NONE; NONI; NOSE; ONER; ONES; REDO; REND; SEEN; SEND; SENE; SIDE; SIND; SINE; SONE.

5-letter words (2 points): 34

DENES; DENIM; DENIS; DINER; DINES; DINOS; DONEE; DONER; DONNE; ENDER; EOSIN; ERNES; FEESE; MINED; MINER; MINES; MINOS; MODER; MONDE; MONER; NEESE; NENES; NOISE; NONES; NONIS; ODISM; ONNED; REDON; REDOS; RENNE; SIDER; SINED; SONDE; SONNE.

6-letter words (3 points): 18

DENIMS; DOMINE; DONEES; DONNEE; DONNES; EONISM; EOSINE; FRENNE; MINDER; MODERN; MOIDER; NEONED; REDOES; REDONE; RENNES; SENDER; SINDON; SONDER.

7-letter words (7 points): 6

DOMINEE; DOMINES; DONNEES; DONNISM; MODERNE; NOMINEE.

8-letter words (11 points): 3

DOMINEES; MODERNES; NOMINEES.

9-letter word (11 points): 1

MODERNISE.