There already was https://pets.meta.stackexchange.com/questions/712/fencing-or-containment , but this is with two different tags that mean sort of the same thing, but are used synonymously, especially as regards fencing.

[tag:containment] and [tag:enclosure]

For argument's sake, we also have [tag:cage], which is used synonymously with [tag:enclosure], especially as regards hutches.

I don't know if we should synonym these or not.  Thoughts?