Round 2 answers:TOOTH DECAY
Each of these answers contains as a substring one of the SI large order-of-magnitude prefixes: DECA, HECTO, KILO, etc. Pair each answer up with the answer from round 1 corresponding to its reciprocal order of magnitude (1015 with 10-15, and so on). Index into the round 1 answers by the position within the round 2 answer of the SI prefix, from smallest to largest in round 2:
toothDECAy diverGed --> G sympatHECTOmy culdesAc --> A daleKILOveyou mobiLesuitgundam --> L ioMEGA muLugetawendimu --> L balanGIGAmassacre ninapErsson --> E illiTERAcy primOrdialsoup --> O centriPETAlforce foreigNdisasterrelief --> NThe answer is GALLEON.