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

tumescent

wine-dark   (thanks and kudos, Jonathan Harnum)

sopping (thanks and kudos, Billy Frolick)

scudding

gamut

WORDS THAT ARE THEORETICALLY INDEPENDENT BUT ACTUALLY ONLY EVER USED WITH ONE SPECIFIC OTHER WORD

trove

 throes

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.