9 letters · 11 points in Scrabble
verb be teeming, be abuzz
verb move in large numbers
verb produce buds, branches, or germinate
originBorrowed from Latin pullulātus, perfect passive participle of pullulō (“sprout forth”), from pullulus (“a young animal, a sprout”), diminutive of pullus.
Etymology from Wiktionary, CC BY-SA 3.0