First there are these things:
[photo and instructions for building it from about.com]
In my AmE dialect, this is called a pinwheel, but in BrE it's called a windmill (because it looks like a 'real' windmill). It may also be called a windmill by Americans as well. Pinwheel in AmE is also extended to other things that resemble including the pinwheel quilt pattern and pinwheel cookies (which resemble the motion more than the thing).
And then there are these things:
[from Open Clip Art Library]
In BrE, this is a bucket and spade. Now, whenever my in-laws discuss these, they put them in that order (bucket and spade), and so I was going to say that this phrase is an irreversible binomial (something we've discussed before) but via Google, I actually find more spade and buckets [see the first comment for vindication of my intuition/experience]. The AmE equivalent (in my dialect, at least) is shovel and pail, which I would put in that order, but for which there are many times more examples of the other order, pail and shovel, online. So, don't listen to me about word orders--apparently I don't know.