Hello everyone, nice to welcome you on our site, this page even has Level 4 answers. I enjoy it =D
Level 4 - GONNLHRO
The answer to this puzzle is:
Words: LORGNON, ORLON, LOGON, HONG, LOON, GOON, NOR, OOH, NOG, HON, RHO, ONO
Bonus words:
LORGNON, ORLON, LOGON, HONG, LOON, GOON, NOR, OOH, NOG, HON, RHO, ONO