Solutions :

3-letter words (1 point): 34

ACT; AHA; ARK; ART; ATE; ATT; CAR; CAT; EAR; EAT; ETA; ETH; GAR; HAE; HAG; HAO; HAT; KOA; KOR; OAR; ORA; ORT; RAG; RAH; RAT; ROK; ROT; TAE; TAR; TAT; TEA; TEE; TET; TOR.

4-letter words (1 point): 52

AGHA; ARAR; ATOK; CARK; CARR; CART; CATE; EATH; ETAT; GART; GHAT; GRAT; GROK; GROT; HAET; HARK; HARO; HART; HATE; KORA; OKRA; OKTA; ORRA; RARK; RATA; RATE; RATH; RATO; ROAR; RORT; ROTA; TACT; TAHA; TAHR; TARA; TARO; TART; TATE; TATH; TATT; TEAR; TEAT; TETE; TETH; THAE; THAR; THRO; TORA; TORR; TORT; TRAT; TROT.

5-letter words (2 points): 25

AORTA; ARHAT; ARRAH; ATTAR; CARAT; CARTA; CARTE; EARTH; GARTH; GRATE; KORAT; ORATE; OTTAR; RATHA; TAROK; TAROT; TATAR; TEETH; TETRA; THRAE; TORAH; TORTA; TORTE; TRACT; TRATT.

6-letter words (3 points): 7

AORTAE; CARATE; CARRAT; CARROT; GARROT; ROTATE; TARTAR.

7-letter word (7 points): 1

TETRACT.