Annihilated rhymes with:
accumulated, assimilated, capitulated, congratulated, emulated, encapsulated, escalated, extrapolated, inoculated, interpolated, manipulated, miscalculated, nonregulated, overregulated, recalculated, reformulated, simulated, stipulated, tabulated, tesselated, titillated, unregulated, ventilated
Annihilated sounds like:
amelita, amulet, amyloid, anawalt, anhalt, annelid, annihilate, annulled