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Level 13 - LNOCOLE
The answer to this puzzle is:
Words: COLONE, LENO, OLEO, ENOL, COON, CLON, LOON, LONE, LOCO, COOL, COLE, CON, EON, ONO, ONE, LOO, OLE, CEL, COL, COO
Bonus words:
COLONE, LENO, OLEO, ENOL, COON, CLON, LOON, LONE, LOCO, COOL, COLE, CON, EON, ONO, ONE, LOO, OLE, CEL, COL, COO