Solutions :

3-letter words (1 point): 38

AIL; AIR; ALA; ALE; ALF; ALL; ALT; ARC; ARE; ATE; CEL; EAT; EFT; ELF; ELL; ELT; ERA; ETA; FER; FET; IRE; LAR; LAT; LEA; LET; LOT; OAT; OLE; RAI; REC; REF; RET; RIA; TAE; TAO; TEC; TEF; TEL.

4-letter words (1 point): 47

ALAE; ALAR; ALEC; ALEF; ALTO; ARET; ARIL; ARLE; CELL; CELT; CLEF; EALE; FELL; FELT; FETA; FLAT; FLEA; LAIR; LALL; LARE; LARI; LATE; LEAL; LEAT; LEFT; LIAR; LIRA; LIRE; LOTA; LOTE; OLEA; OLLA; RAIL; RALE; REFT; RIAL; RILE; TAEL; TALA; TALE; TALL; TELA; TELE; TELL; TOLA; TOLE; TOLL.

5-letter words (2 points): 29

ALATE; ALEFT; ALLEL; ALLOT; ALTER; ATOLL; CELLA; CELLO; CERIA; CLEFT; EATER; ELATE; FELLA; FERAL; FERIA; FETAL; FLOAT; FLOTA; FLOTE; LATER; OATER; OLLER; RAILE; TALAR; TALEA; TALER; TELAE; TELIA; TERAI.

6-letter words (3 points): 14

ALLELE; CELLAE; CELLAR; CLARET; ECLAIR; ELATER; FERIAL; FLOTEL; LEALER; OLEATE; TALLER; TELIAL; TELLAR; TOLLER.

7-letter words (7 points): 4

FLOATEL; FLOATER; LATERAL; REFLOAT.