Synonyms for Bulk (same or very similar meaning)
WordNet sense 1 (the property resulting from being or relating to the greater in number of two parts; the main part):
majorityWordNet sense 2 (the property of something that is great in magnitude):
mass, volumeWordNet sense 3 (cause to bulge or swell outwards):
bulgeFrom the ODE community, based on WordNetadd/edit