Actually, two new list ideas, each of which I have generously started.
WORDS INEVITABLY ACCOMPANIED BY A SPECIFIC OTHER WORD, LIKE A FAITHFUL OLD RETAINER
wine-dark (thanks and kudos, Jonathan Harnum)
sopping (thanks and kudos, Billy Frolick)
WORDS THAT ARE THEORETICALLY INDEPENDENT BUT ACTUALLY ONLY EVER USED WITH ONE SPECIFIC OTHER WORD
Please add–or subtract, if you can find exceptions. I’m actually too busy writing my new novel to come up with more than one apiece, but I think both lists have merit.