Luckily we don't have to speculate. See a web interface at [1]. Select English from the dropdown and it says that the closest word to king is kings and second is queen, then monarch. And to test my second statement I also tried "red is to king as blue is to ___" and got kings and queen as the top two answers.
I did the same thing with Japanese and Western movies, and the result was not due to the movies just being close. See https://strandmark.wordpress.com/2017/07/08/the-vector-from-...