Solutions :

3-letter words (1 point): 29

BEG; BET; BEZ; BIG; BIO; BIT; GET; GIB; GIE; GIT; ION; IOS; ITS; LIB; LIT; NOS; NOT; OIL; ONS; SON; SOT; TEG; TET; TIE; TIG; TIL; TIT; TON; TOT.

4-letter words (1 point): 34

BETS; BIOS; BITE; BITO; BITS; BITT; GEIT; GETS; GIBE; GITE; IONS; LION; LITE; LITS; NOIL; NOTE; NOTT; ONST; SNOT; SOIL; STET; STOT; TETS; TIGE; TILT; TITE; TITI; TITS; TOIL; TOIT; TONS; TOST; TOTE; TOTS.

5-letter words (2 points): 12

BETON; BIONT; BITOS; BITTE; BITTS; BLITE; GIBLI; LIONS; STILB; STILT; STOIT; TOITS.

6-letter words (3 points): 5

BETOIL; BETONS; BIONTS; BITTIE; TITBIT.

7-letter words (7 points): 3

BIOTITE; SNOTTIE; TITBITS.

8-letter word (11 points): 1

STILBITE.