Mongo not starting HELP

so when i d systemctl status mongod it says fialed. but when i do systemctl status mongodb it says active.

What is the difference between the 2?How can I fix this issue? I really don’t understand what i did wrong.

This is what my nmap scan says though.

nmap -sS -p 4000,27017,80,22,443 157.245.5.153
Starting Nmap 7.92 ( https://nmap.org ) at 2022-07-23 13:52 Eastern Daylight Time
Nmap scan report for 157.245.5.153
Host is up (0.0064s latency).

PORT      STATE  SERVICE
22/tcp    open   ssh
80/tcp    open   http
443/tcp   closed https
4000/tcp  open   remoteanything
27017/tcp open   mongod;