How can I have a code that randomly selects one word out of three repeat one its own without a button being pressed?

I want to write a code that will randomly choose one word out of three (apple,tiger,stick) and then execute the following code below. Then once the crazyappleprefab turns false, I would like the random word code to randomly select another word again and set off another instantiation and uninstantiation after a certain period of time. Like 5 seconds or something. Thanks!

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI;

public class Appletime : MonoBehaviour //// This code codes for an object to instantiate every five seconds and have each object remain indefinitely. {

 float TmStart; // this means time start
 float TmLen = 5f; // this means length of time
 public Text randomTextOutcome;
 public Text Apple;
 private int AppleCount;
 public GameObject crazyApplePrefab;
 
   





 // Start is called before the first frame update
 IEnumerator Start()
 {
     
     AppleCount = 0;

     yield return new WaitForSeconds(TmLen);
     int x = Random.Range(-3, 3);
     int z = Random.Range(-3, 3);

     randomTextOutcome.text = "Apple".ToString();
     Apple.text = AppleCount + 1.ToString();
     Vector3 pos = new Vector3(x, 1, z);
     GameObject crazyApple = Instantiate(crazyApplePrefab, pos, Quaternion.identity);
     yield return new WaitForSeconds(10);
     crazyApple.SetActive(false);
     randomTextOutcome.text = "".ToString();


 }