There's more to it than just pronounceable. e.g. I got tranclitic, mysothelium, gurnt,

1. tran- looks like reanalysis of words that begin with trans-, and we often pronounce the -s with the start of the root word. Clitic is a word in and of itself.

2. myso- is a rare Greek prefix, thelium means nipple. Unfortunately, together it would suggest nipple of dirt.

3. There's a low-scored urbandictionary entry for gurnt, but that's about it.

I think there's some knowledge of morpheme-like objects in the AI.