Common words finder, containing desired Kanji

Using For loop with HTML requests. It goes from fetchInfo(x[i]) to fetchInfo(x[i+1]) before HTML requests finishes, so I can’t just use the Loop with += fetchInfo(x[i]).

My guess is I have to go x[0]x[n] simultaneously, as mentioned here Vocab list (separated by ',') generator -- add reading and meaning - #9 by rfindley about Promises – but I don’t know how to apply the code. I failed to try to integrate the suggested code.

Also, I am trying to use single button, or auto-conversion from 喋屁繋檎蛙儲騙 to the result above.