Artificial intelligent assistant

The word for "den" as in a fox's den? We all know that a fox is a (kitsune). But what's the word for the burrow/den that a lives in? This one is stumping the translation tools and old fashioned paper dictionaries I've got my hands on.

Most commonly, it would be:

> {}{} or
>
> {}

for us native speakers.

(Far) less common would include:

> {}
>
>

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