After my 2nd guess, being completely stumped, I decided to try to visualizer, just to see what it said. Understanding that it was cheating, and all that, but... I was very curious. I entered just the "OU" and "N" from my 2nd guess into the relevant slots and it told me there were 0 words available. So it didn't help me anyway.
It appears the answer is not in the word list the site used. Checking the original Wordle source and it only appears once: in the list of possible guesses but not as a possible answer.
Wordle 646 2/6*
Wordle 646 5/6
Wordle 646 5/6*
Wordle 646 4/6
Wordle 646 3/6*
Wordle 646 3/6*
Wordle 646 4/6*
Wordle 646 4/6
Wordle 646 3/6
Wordle 646 3/6*
Wordle 646 4/6
Wordle 646 3/6*
Wordle 647 4/6
Wordle 647 5/6*
Wordle 647 3/6
Wordle 647 5/6*
Wordle 647 4/6*
Wordle 647 4/6
Wordle 647 4/6*
Wordle 647 4/6*
Wordle 647 3/6
Wordle 647 4/6
Wordle 647 4/6*
Wordle 647 6/6
Wordle 648 3/6*
Wordle 648 3/6
Wordle 648 5/6*
Wordle 648 4/6*
Wordle 648 4/6
Wordle 648 4/6
Wordle 648 3/6
Wordle 648 4/6
Wordle 648 5/6*
Wordle 648 3/6*
Wordle 648 4/6*
Wordle 648 4/6*
Wordle 649 5/6*
Wordle 649 5/6*
Wordle 649 3/6
Wordle 649 4/6*
That final black square on guess 3 was a kick in the shins.
Wordle 649 3/6
Wordle 649 4/6*
Wordle 649 5/6
Wordle 649 4/6
Wordle 649 4/6*
Wordle 649 2/6*
Wordle 649 5/6
Wordle 649 5/6*
Wordle 650 3/6*
Wordle 650 6/6*
Wordle 650 4/6*
Wordle 650 3/6*
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Wordle 650 3/6
Wordle 650 4/6*
Wordle 650 4/6
Wordle 650 4/6
Wordle 650 4/6
Wordle 650 5/6*
Wordle 651 3/6*
Wordle 651 3/6
Wordle 651 4/6*
Wordle 651 2/6*
Big swing from yesterday’s 6
Wordle 651 3/6
Wordle 651 3/6
Wordle 651 4/6*
Wordle 651 3/6
Wordle 651 3/6*
Way better than Pepper’s story 🤢
Haha!
Wordle 651 3/6*
Wordle 651 2/6
Wordle 652 4/6*
Wordle 652 3/6
Wordle 652 3/6
Wordle 652 3/6*
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Wordle 652 3/6*
Wordle 652 4/6*
Wordle 652 4/6*
Wordle 652 4/6*
Wordle 652 3/6
Wordle 652 4/6
Wordle 652 3/6
Wordle 653 4/6
Wordle 653 6/6