How do I generate a random dictionary word in java?

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Java

random

I'm trying to develop a Java program which presents Users with encrypted word and asks them to decode it. Currently I present random words from an array after encrypting them with a random Caesar shift number. Could you please advise on how this can be achieved with a bigger word source, any web service or online database i can access by index?

Thank you

What I have tried:

Thus far i am using a simple array as word source:

import java.util.Scanner;
import java.lang.Math;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
public class Main
{
	public static void main(String[] args) {
	    HashMap<Integer,String> map = new HashMap<>(); 
	    
map.put(0,"a");
map.put(1,"b");
map.put(2,"c");
map.put(3,"d");
map.put(4,"e");
map.put(5,"f");
map.put(6,"g");
map.put(7,"h");
map.put(8,"i");
map.put(9,"j");
map.put(10,"k");
map.put(11,"l");
map.put(12,"m");
map.put(13,"n");
map.put(14,"o");
map.put(15,"p");
map.put(16,"q");
map.put(17,"r");
map.put(18,"s");
map.put(19,"t");
map.put(20,"u");
map.put(21,"v");
map.put(22,"w");
map.put(23,"x");
map.put(24,"y");
map.put(25,"z");


	    String[] plainTextWords={"and","now","mean","hey"};
		int shift = (int)(Math.random()*10);
		System.out.println(shift);
		int plainWordIndex=shift%4;
		String plainWord=plainTextWords[plainWordIndex];
		String encryptedWord="";
		//	System.out.println(plainWord);
		for(int i=0;i<=plainWord.length()-1;i++)
		{
		    String letter = String.valueOf(plainWord.charAt(i));
		    int num1=getKeyFromValue(map,letter);	
		    int encryptedCharIndex=(num1+shift)%26;
		    String encryptedLetter=map.get(encryptedCharIndex);
		    encryptedWord=encryptedWord+encryptedLetter;
		}
	
		System.out.println(encryptedWord);
		System.out.println("Hello User, please decrypt above word and enter your answer");
		Scanner sc=new Scanner(System.in);
		String answer=sc.nextLine();
		System.out.println(answer);
		if(answer.toLowerCase().equals(plainWord))
		{
		    System.out.println("Cheers, you cracked this Caesar's cipher");
		}
		else
		{
		    System.out.println("Not yet there, please try again");
		}
		
	}
	 private static <K, V> K getKeyFromValue(Map<K, V> map, Object value) {
        
        //get all map keys using keySet method
        Set<K> keys = map.keySet();
        
        //iterate all keys
        for(K key : keys){
            
            //if maps value for the current key matches, return the key
            if( map.get(key).equals(value) ){
                return key;
            }            
        }
        
        //if no values matches, return null
        return null;        
    }
}