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Level 18 - INTPOAC
The answer to this puzzle is:
Words: PACTION, ATOPIC, ATONIC, CATION, CATNIP, ACTIN, PINTA, PICOT, PANTO, PITON, OPTIC, ONTIC, COTAN, OCTAN, INAPT, PATIN, PINTO, PINOT, CANTO, COATI, COAPT, CAPON, ANTIC, TOPIC, TONIC, COIN, PION, PITA, TACO, CAIN, TOPI, PINA, CION, CONI, PAIN, PACT, OTIC, TAIN, PIAN, PINT, CAPO, NIPA, CANT, CIAO, PICA, ICON, INTO, IOTA, ATOP, NOTA, ANTI, PANT, APT, NAP, POT, TOP, PAT, TAN, ANT, ACT, CAN, ANI, CON, OPT, CAP, PAN, COP, COT, ION, NIP, NIT, NOT, OAT, TIC, POI, PIC, PIN
Bonus words:
PACTION, ATOPIC, ATONIC, CATION, CATNIP, ACTIN, PINTA, PICOT, PANTO, PITON, OPTIC, ONTIC, COTAN, OCTAN, INAPT, PATIN, PINTO, PINOT, CANTO, COATI, COAPT, CAPON, ANTIC, TOPIC, TONIC, COIN, PION, PITA, TACO, CAIN, TOPI, PINA, CION, CONI, PAIN, PACT, OTIC, TAIN, PIAN, PINT, CAPO, NIPA, CANT, CIAO, PICA, ICON, INTO, IOTA, ATOP, NOTA, ANTI, PANT, APT, NAP, POT, TOP, PAT, TAN, ANT, ACT, CAN, ANI, CON, OPT, CAP, PAN, COP, COT, ION, NIP, NIT, NOT, OAT, TIC, POI, PIC, PIN