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I was a little surprised by this so looked up how common a word it is.

This Google dataset puts it as the 5,109th most frequent word, between cached and slip

https://github.com/first20hours/google-10000-english/blob/ma...

This one from the British National Corpus puts it 7,702nd between "pro" and "frontier"

http://www.wordcount.org/main.php

The Google dataset might not be the best for measuring this. Names and abbreviations rank highly. I think Warren Buffet might help contribute to the high ranking of 'warren'.

A warren is where rabbits and/or other burrowing creatures live. aka rabbit hole, burrow. It's common enough in children's literature like Watership Down.

What?? It's a perfectly ordinary very common English word.

A rabbit warren

It's a common word? Rabbit warren.

Loads of little hidiholes of separate content that are connected by a larger network.