erupt / irrupt [ɪˈrʌ󠇄pt]
erupt – v. intr. – 1. burst forth suddenly, break out; 2. of volcano – become active, eject lava; 3. appear as a rash, boil, etc., on the skin; 4. (of teeth) break through the gums
irrupt – v. intr. – (followed by into) enter forcibly or violently