Most radiology teachers want to be unionized.
Explanation: That’s both union-ized, for part of a union, or un-ionized, for not ionized
That said, that’s a really good way to describe the difference. If you’re a native speaker, you’ve got really good insight (your native language has a lot of blind spots, where you know what is right, but not why), and if you’re not, then your English is really good!
Thanks. I am a native English speaker. I just hate how inconsistent it is so I try to think up as many rules as I can to apply some kind of logic to it.