28 words of 3 letters (1 points):AIS; ASP; BEG; BIO; BIS; BOI; BOS; BUS; IOS; ISO; OBI; PAS; PSI; PUB; PUS; SAI; SAP; SAU; SIB; SIX; SOB; SPA; SUB; SUI; SUP; SUS; UPS; XIS.

17 words of 4 letters (1 points):APSO; ASPS; BIOS; BOIS; BUSS; IBIS; OBIS; PAIS; PUBE; PUBS; PUSS; SAPS; SPAS; SUBS; SUPS; SUSS; UPAS.