Synonyms for Pullulate (same or very similar meaning)
WordNet sense 1 (be teeming, be abuzz):
swarm, teemWordNet sense 2 (move in large numbers):
pour, streamWordNet sense 3 (produce buds, branches, or germinate):
germinate, shoot, sprout, spud, bourgeon, burgeon forthFrom the ODE community, based on WordNetadd/edit