I scored 90.88 points on my first and only try with the following words: frenzy ghoul protocol concept autocracy hymn nephew screwdriver bail molecule. (Of which only the first seven words are scored when all are valid.) “Autocracy” is arguably the least commonly used word of those. After seeing the resulting scoring matrix, I realized that some of the words were too close to each other like frenzy with ghoul and protocol with concept. There was certainly some kind of priming effect going on when I selected those.

My point is, while the test can certainly be gamed, I don’t think that you need to pick highly unusual words to score high (90+).