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Level 18 - PAXEINL
The answer to this puzzle is:
Words: PINEAL, ALPINE, ALEXIN, XENIAL, PENIAL, PENAL, XENIA, ALINE, AXILE, ELAIN, LIANE, PILEA, PLENA, LAPIN, NEPAL, ANILE, PINA, PIAN, LIPE, ELAN, NAIL, PINE, ANIL, PALE, LEAN, LINE, PLEA, PLEX, PEAL, LIPA, AXLE, ILEX, LAIN, PANE, LEAP, AXEL, LIEN, APEX, NAPE, NEAP, NIPA, PAIL, AXIL, LIP, LIE, ALE, NAP, PEA, ANI, PAN, LAX, PIE, PAL, LEA, LEI, LEX, LIN, NIL, NIP, NIX, PIX, AIL
Bonus words:
PINEAL, ALPINE, ALEXIN, XENIAL, PENIAL, PENAL, XENIA, ALINE, AXILE, ELAIN, LIANE, PILEA, PLENA, LAPIN, NEPAL, ANILE, PINA, PIAN, LIPE, ELAN, NAIL, PINE, ANIL, PALE, LEAN, LINE, PLEA, PLEX, PEAL, LIPA, AXLE, ILEX, LAIN, PANE, LEAP, AXEL, LIEN, APEX, NAPE, NEAP, NIPA, PAIL, AXIL, LIP, LIE, ALE, NAP, PEA, ANI, PAN, LAX, PIE, PAL, LEA, LEI, LEX, LIN, NIL, NIP, NIX, PIX, AIL