Solutions :

3-letter words (1 point): 36

ARD; ART; ATE; EAR; EAT; ETA; ETH; FRO; FUN; FUR; HET; HUE; HUT; NUR; NUT; ORF; OUR; OUT; RAT; RHO; RUE; RUN; RUT; TAE; TAR; TEA; TEE; THE; THO; TUN; TUT; URD; URN; UTA; UTE; UTU.

4-letter words (1 point): 44

DRAT; EARD; EARN; EATH; ETHE; EURO; FUND; FURR; HEAR; HEAT; HETE; HOUF; HOUR; HOUT; HURT; NURD; NURR; OURN; RATE; RATH; RATU; RHEA; ROUE; ROUT; RUND; RUNT; RURU; RUTH; TARN; TART; TEAR; TEHR; THEE; THOU; THRO; THRU; TRAT; TRUE; TUFT; TUND; TURD; TURF; TURN; TUTU.

5-letter words (2 points): 14

ARNUT; ARUHE; EARTH; EATHE; FURTH; HEARD; HEART; HURRA; RATHE; ROUTE; ROUTH; TRUTH; TUTEE; URATE.

6-letter words (3 points): 3

OUTRUN; TUNDRA; UNTRUE.

7-letter words (7 points): 3

OUTEARN; OUTHEAR; UNTRUTH.

8-letter word (11 points): 1

OUTHEARD.