Kind like that thing where ones native language doesnt have a specific pithy single word or phrasal expression to store its meaning
For extra fun (see my example in the replies) give
the fluent explanation
SPOILER (even if you dont have it, just leave it blank if you dont so people dont know whether there’s an answer beforehand
Begriff + s + assoziativität + s + kombinatorik
Word/term + s + associativity + s + combinatoric
So it is the combinatoric of associativity between words.
The “s” in there are just for easier speaking, which itself has a compoundword name: Fugen-s, so literally translated: Joint-s