Non-native speaker of English here, got 81k. Mostly with intelligence, not language skills.

Once you figure out the pattern of "one answer sounds like the requested word, two are opposites, one is unrelated", the test suddenly becomes easy. Not all questions follow that pattern, but many of them do.

Sometimes there are two or three answers that sound like the question, sometimes a word that is clearly an adjective relating to a person (ending in -us) has non-adjective definitions. I don't think there's even a single question where more than two of the answers make sense, even if you've never heard the word before. That leaves very little room for mistakes.