Synonyms for Steamroller (same or very similar meaning)
WordNet sense 1 (a massive inexorable force that seems to crush everything in its way):
juggernautWordNet sense 2 (vehicle equipped with heavy wide smooth rollers for compacting roads and pavements):
road rollerWordNet sense 3 (bring to a specified state by overwhelming force or pressure):
steamrollFrom the ODE community, based on WordNetadd/edit