Good words! How did you find/build the list?
The bolding on mouseover is helpful; "wander" as a label is strong.
The lack of labels on the two buttons until mouseover was a bit confusing at first, but on second thought I suppose it's to avoid visual competition/confusion with the other/nestable words? I wonder if this may impact mobile usability (if that's planned) though.
It'd be neat if there was a bit of animation while wandering -- even something as simple as the words appearing in random sequence, after the others disappear.
Definitely enjoyed using this. I've always liked playing with concrete poetry.
Thanks for making this!