Solutions :

3-letter words (1 point): 50

ANE; ARE; AUE; EAN; EAR; EAU; EEL; EEN; ENE; EON; ERA; ERN; LEA; LEE; LEU; LOO; LOR; LOY; NAE; NEE; NEP; NOO; NOR; NOY; OLE; ONE; ONO; ONY; OON; OOP; OOR; OPE; ORA; ORE; OUR; PEA; PEE; PEN; PER; POO; RAN; REE; REN; REO; REP; ROE; ROO; RUE; URE; YON.

4-letter words (1 point): 68

AEON; AERO; ARLE; EARL; EARN; EELY; ENOL; EORL; EPEE; EURO; LEAN; LEAR; LEEP; LEER; LENO; LONE; LOON; LOOP; LORE; LORN; LORY; LYNE; NARE; NEAR; NEEP; NENE; NEON; NOEL; NOLE; NOOP; NOPE; OLEA; ONER; OPEN; ORLE; PEAN; PEAR; PEEL; PEEN; PEER; PENE; PEON; PONE; PONY; POOL; POON; POOR; PORE; POUR; REAN; REAR; REEL; REEN; RELY; RENY; REPO; ROLE; RONE; ROON; ROOP; ROPE; RORE; RORY; ROUE; RUER; UREA; YOOP; YORE.

5-letter words (2 points): 20

ARENE; EARLY; ENROL; LEARN; LEEAR; LEONE; LONER; LOONY; LORAN; NEPER; NEROL; ONELY; PEARE; PEARL; PEEOY; PEONY; RANEE; RONEO; ROUEN; ROYNE.

6-letter words (3 points): 14

ANERLY; LOOPER; NEARLY; NEURON; OPENER; OPERON; PEARLY; PERONE; POOLER; POORLY; REARLY; REEARN; REOPEN; REPONE.

7-letter words (7 points): 2

AUREOLE; NEURONE.

8-letter word (11 points): 1

REOPENER.