JSFiddle - React, Tailwind, and code Playground

JavaScript

var words =[];
 window.onload =function(){
 words = getwords();
     alert(words);
 };

    function getwords(){
var block = [];
var keyword=['HELLO', 'CYCLE','bicycle','tricycle','mobster','ditus','mapper','looper','dingdong','maple','oak','sigma','dogma','ruffy'];
var index = [];
for(var p=0 ;p< keyword.length ;p++)
{
index[p]=p;
}
        alert(index);
for(var i=0; i< 8 ;i++){
var x = Math.floor(Math.random() *(keyword.length-1));
for(var j=0; j <= i ; j++)
{ if((words[j]!== keyword[x]) ||( index[x] !==1)) 
{
block[i]= keyword[x];
index[x]=1;
}}}

return block;

}