A bubble wand is a stick with at least one circle (or other closed shape with a hole in the middle) attached to it. Bubbles are created by dipping it in soap and either blowing on it or waving it through the air. For example, from Amazon:

A bubble blower is a machine that blows bubbles (though it could also refer to a person who's blowing bubbles with a wand). You pour in bubble soap somewhere, and I guess some sort of fan blows bubbles out of a part that's essentially a bubble wand. Most of these seem to be powered by either batteries or by plugging in directly, though I would also use the term to refer to a similar device that's powered manually (e.g., by turning a crank or pushing a lever). Again, from Amazon:
