Hello everyone, nice to welcome you on our site, this page even has Level 4 answers. I enjoy it =D
Level 4 - IREUNSS
The answer to this puzzle is:
Words: INSURES, NURSES, SIRENS, RINSES, RESINS, INSURE, ISSUER, INURES, RUSINE, URSINE, SERINS, SIEURS, URINES, SUERS, REINS, RISUS, RISES, RISEN, INURE, RUSES, NISUS, RUINS, RESIN, SIEUR, SINUS, RUNES, SERIN, SINES, RINSE, SIRES, SEIS, SUES, SIRS, URNS, USES, SINS, RUNS, SUNS, SURE, RUES, RINS, NESS, REIN, REIS, RISE, RUNE, RUSE, SINE, SIRE, ERNS, SEN, SER, RUE, RES, SIS, URN, IRE, INS
Bonus words:
INSURES, NURSES, SIRENS, RINSES, RESINS, INSURE, ISSUER, INURES, RUSINE, URSINE, SERINS, SIEURS, URINES, SUERS, REINS, RISUS, RISES, RISEN, INURE, RUSES, NISUS, RUINS, RESIN, SIEUR, SINUS, RUNES, SERIN, SINES, RINSE, SIRES, SEIS, SUES, SIRS, URNS, USES, SINS, RUNS, SUNS, SURE, RUES, RINS, NESS, REIN, REIS, RISE, RUNE, RUSE, SINE, SIRE, ERNS, SEN, SER, RUE, RES, SIS, URN, IRE, INS