Hello everyone, nice to welcome you on our site, this page even has Level 9 answers. I enjoy it =D
Level 9 - NIOOINPS
The answer to this puzzle is:
Words: OPSONIN, PINIONS, PINION, INIONS, ONIONS, PINONS, PIONS, PINON, OPSIN, NOONS, POONS, INION, POON, PION, POIS, PINS, OOPS, INNS, NISI, IONS, PISO, NIPS, ONO, NOS, INS, SIP, OPS, NIP, POI, POO, SOP, PSI
Bonus words:
OPSONIN, PINIONS, PINION, INIONS, ONIONS, PINONS, PIONS, PINON, OPSIN, NOONS, POONS, INION, POON, PION, POIS, PINS, OOPS, INNS, NISI, IONS, PISO, NIPS, ONO, NOS, INS, SIP, OPS, NIP, POI, POO, SOP, PSI