Hello everyone, nice to welcome you on our site, this page even has Level 14 answers. I enjoy it =D
Level 14 - YSTSAIF
The answer to this puzzle is:
Words: FASTS, SATIS, FIATS, SAYST, SIFTS, FISTS, FATS, FITS, FAYS, AITS, SITS, SAYS, SAT, SIS, ITS, AFT, STY, ASS
Bonus words:
FASTS, SATIS, FIATS, SAYST, SIFTS, FISTS, FATS, FITS, FAYS, AITS, SITS, SAYS, SAT, SIS, ITS, AFT, STY, ASS