Synonyms for Voraciousness (same or very similar meaning)
WordNet sense 1 (excessive desire to eat):
voracity, edacity, esurience, ravenousness
WordNet sense 2 (extreme gluttony):
rapaciousness, rapacity
WordNet sense 3 (an excessive desire for wealth (usually in large amounts)):
greediness
From the ODE community, based on WordNet
add/edit