Solutions :

3-letter words (1 point): 60

ALT; ANE; ANT; ARB; ARE; ARF; ART; ATE; AUE; AXE; BAR; BAT; BRA; BRR; EAR; EAT; EAU; EEN; ERA; ERF; ERR; ETA; FAB; FAE; FAR; FAT; FAX; FRA; LAR; LAT; LAX; NAT; NEE; NET; NUR; NUT; RAN; RAT; RAX; REB; REE; REI; REX; RUE; RUN; RUT; TAB; TAE; TAN; TAR; TAU; TAX; TEE; TEN; TUI; TUN; TUX; URE; UTA; UTE.

4-letter words (1 point): 54

ANTA; ANTE; ARBA; ATUA; AUNE; AUNT; AXAL; BARE; BARF; BATE; BAUR; BRAE; BRAN; BRAT; EAUX; ETNA; ETUI; FARE; FATE; FAUN; FAUR; FAUT; FAUX; FRAB; FRAE; FRAT; FRAU; FREE; IURE; LANE; LANT; LARE; LATE; LATU; NARE; NURR; RANT; RARE; RATA; RATE; RATU; RAUN; REAR; REEN; RUNE; RUNT; TANE; TARE; TAXA; TEER; TUNA; TUNE; TURF; UREA.

5-letter words (2 points): 31

ALTAR; ANTAE; ANTAR; ANTRE; AUREI; BARRE; BRANT; EATEN; ENURE; EXALT; EXTRA; FATAL; FAUNA; FRATE; FREET; LATEN; LAXER; RANEE; RAREE; RATAL; RATAN; REATA; REATE; REBAR; TABER; TARRE; TAXER; TENUE; UNTAX; URAEI; URATE.

6-letter words (3 points): 9

AFREET; BERATE; ERRATA; FAUNAL; NATURA; NATURE; REBATE; TENURE; TUREEN.

7-letter words (7 points): 2

NATURAE; NEUTRAL.