JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>

JavaScript

var defaultArray = [{age:"25-35",country:"united kingdom",sex:"male",word:"rain"},{age:"25-35",country:"united arab emirates",sex:"male",word:"hot"},{age:"25-35",country:"zimbabwe",sex:"female",word:"rain"}];

  /* Popular */
  function popular() {
    var words = [];
    
    for(var p = 0; p < defaultArray.length; p++){
      var word = defaultArray[p].word;
      words.push(word);
    }
    
    console.log(mostPopularWord(words))
   
  }
  
  popular();
  
  function mostPopularWord(arr){
    return arr.sort(function(a,b){
        return arr.filter(function(v){ return v===a }).length
             - arr.filter(function(v){ return v===b }).length
    }).pop();
	}