French spelling is quite regular. Once you know the system, you know how to spell almost any word. The only issue is that some letters are not pronounced.
Since you mention the /eɪ/ diphthong, in French it can be spelled é, ée, et, ed, er, ai, and many others. What is making the French spelling harder, I think, is that many letters are not pronounced, and some words have the same pronunciation with a different spelling (for example: cou - neck - and coup - hit). I can't think of anything in particular, but it all lies in the fact that many letters are not pronounced. I found this website - in French - where you can have fun testing your French spelling: http://timbresdelorthographe.com/
I could say that in Russian the sound [о] can be spelled ол as in солнце, but that would be bullshit. Russian is a largely phonetic language, it's just that consonant clusters get simplified in pronunciation.
Funny how half of your list are also French words
thought, though, through, tough, trough, plough, and, somewhat questionably, hiccough.
What are the others supposed to be?