Not sure I understand how to use this. I searched for "monkey on car" and these are the "categories" I get:
"a dead monkey", "a monkey dancing", "a dead monkey" (again), "a ca"
"a dead monkey", "a monkey dancing", "a dead monkey" (again), "a ca"
I find it a amusing that the site seems almost eager to suggest related terms that it then refuses to generate images of.
We're using a synonym API that's separate from the image summoning. Basically our filtering happens after the synonym API, but before the image summoning API.