Solutions :

3-letter words (1 point): 50

ANE; ARE; BRR; BRU; BUR; BUT; EAN; EAR; ENE; EON; ERA; ERE; ERN; ERR; ERS; ION; IRE; LEI; LEP; LEU; LIE; LOR; NAE; NEP; NOR; OIL; OLE; ONE; ORA; ORE; PEA; PEN; PER; PRE; PRO; RAN; REI; REN; REO; REP; ROE; RUB; RUE; RUT; SRI; TUB; TUI; URB; URE; URP.

4-letter words (1 point): 63

AERO; BREI; BREN; BRER; BRIE; BRIO; BRRR; BRUT; BURP; BURR; BURS; EARN; ENOL; ERNE; ERRS; IURE; LEIR; LENO; LEPS; LERE; LERP; LIEN; LIER; LIEU; LION; LIRE; LOIR; LONE; LORE; LORN; NARE; NEAR; NEPS; NERD; NOEL; NOIL; NOIR; NOLE; ONER; PEAN; PEAR; PENE; PEON; PERE; PERI; PERN; PERT; REAN; REAR; REPS; RIEL; RILE; ROIL; ROLE; RONE; RUBS; RUER; TRIE; TRIO; TRUE; TUBS; URBS; URPS.

5-letter words (2 points): 50

ANOLE; ARENE; ARPEN; BRERE; BRIER; BURPS; BURRO; DREAR; DRERE; ENROL; LEIRS; LEONE; LEPER; LEPRA; LERPS; LIERS; LOIRS; LONER; LORAN; NARRE; NEPER; NERDS; NEROL; NOIRS; OILER; ONERS; PEARE; PELON; PEREA; PERIL; PRIER; PRION; PRIOR; PROLE; PRONE; REOIL; REPEL; REPRO; RERAN; SPEAN; SPEAR; SPEIL; SPEIR; SPRUE; TRIER; TRIOL; TRIOR; TRUER; TURPS; URENA.

6-letter words (3 points): 22

BURIER; BURREL; BURRER; DREARE; EARNER; LEPERS; LIERNE; LONERS; NEARER; NEPERS; NEROLI; OILERS; PEREON; PERONE; PERRON; PROLER; PRONER; REARER; SPERRE; SPRIER; TRIENE; TURION.

7-letter words (7 points): 8

BURRERS; DREARER; EARNERS; PEREION; PROLERS; PRONEUR; REARERS; SPEARER.

8-letter word (11 points): 1

PRONEURS.