Do you ever find yourself trying to turn an adjective, which came from a noun, back into a noun by adding a suffix but finding you've made a colossal mess of the English language in the process? Or is that just me?

Most recently, while working on a paper addressing ambiguity in Wordsworth's "Strange Fits of Passion I have Known," Now, I have trouble pronouncing "ambiguity" and "ambiguous" because the stressed part of the word changes! But as I'm writing, I keep wanting to add a suffix onto "ambiguous" to make it something like "ambiguousness" or "ambiguousity." But then when my mind says it, I have to laugh at myself, yet again! I've done this so many times while tripping through this 8 page paper--which only had to be 5, but once you get me going, its hard for me to pull back. So, without a max, 8 it is! haha...

Do you have any words that you do that to? Or seem to always mispronounce?