Question the name does not exist ??

1) error CS0103: The name 'gameobject' does not exist in the current context
2) error CS0103: The name 'instantiate' does not exist in the current context

i dont get what im doing wrong ??

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class PipeUp : MonoBehaviour
6. {
7.  
8.     private Character character;
9.     public GameObject pipeDown;
10.     // Use this for initialization
11.     void Start()
12.     {
13.         character = FindObjectOfType<Character>();
14.     }
15.  
16.  
17.     // Update is called once per frame
18.     void Update()
19.     {
20.         if (character.transform.position.x - transform.position.x > 30)
21.         {
22.  
23.             float xRan = Random.Range(0, 10);
24.             float yRan = Random.Range(-5, 5);
25.             float gapRan = Random.Range(0, 3);
26.  
27.             instantiate(gameobject, new Vector2(character.transform.position.x + 30 + xRan, -11 + yRan), transform.rotation);
28.             instantiate(pipeDown, new Vector2(character.transform.position.x + 30 + xRan, 12 + gapRan + yRan), transform.rotation);
29.             Destroy(gameObject);
30.  
31.         }
32.     }
33.  
34.     void OnCollisionEnter2D(Collision2D other)
35.     {
36.         if (other.gameObject.tag == "Player")
37.         {
38.             character.Death();
39.         }
40.     }
41.  
42. }
43.