Hello everyone, nice to welcome you on our site, this page even has Level 4 answers. I enjoy it =D
Level 4 - POVKEOR
The answer to this puzzle is:
Words: POOVE, KORE, REPO, ROVE, PERV, ROE, REP, POO, REV
Bonus words:
POOVE, KORE, REPO, ROVE, PERV, ROE, REP, POO, REV