Here is a helpful tip from the Libro Editing blog on the uses of irrup and erupt.
This one was suggested by my husband, a keen birdwatcher (see below for why that’s relevant) and adder of troublesome pairs to my list.
Erupt is perhaps the better-known of the two. To erupt is to forcefully throw out rocks, lava, gas and ash, if you’re a volcano. The next meaning is to break out suddenly, usually used of something like a fight, and similarly, you can erupt into laughter, meaning it happens suddenly and forcefully. Finally, a spot or rash erupts when it appears suddenly on the skin, and a tooth erupts through a gum when it grows in your mouth and becomes visible.
To irrupt, also a verb, means to burst into somewhere, to enter suddenly or even forcibly. The kind of thing people do when they break down a door. Interestingly, I’ve seen people being described as “erupting” in this sense, but let’s use irrupt here…
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