Synonyms for Rapacious (same or very similar meaning)
WordNet sense 1 (living by preying on other animals especially by catching living prey):
predatory, ravening, vulturous, raptorial, vulturineWordNet sense 2 (excessively greedy and grasping):
voraciousWordNet sense 3 (devouring or craving food in great quantities):
edacious, esurient, ravenous, wolfishFrom the ODE community, based on WordNetadd/edit