Make a Full Mavericks Installer

You can use a Terminal command to create a bootable USB flash drive installer but you need to real installer sitting in the Applications folder. From your post, I take it you don't have the full installer application.

If you have an Internet connection, preferably, Ethernet, then try this:

Internet/Network Recovery of El Capitan or Later on a Clean Disk

     If possible, back up your files before proceeding.

1. Restart the computer. Immediately, at or before the chime, hold down the (Command-Option-Shift-R) keys until a globe appears.
2. The Utility Menu will appear in from 5-20 minutes. Be patient.
3. Select Disk Utility and click on the Continue button.
4. When Disk Utility loads select the target drive (out-dented entry w/type and size) from the side list.
5. Click on the Erase button in Disk Utility's toolbar. A panel will drop down.
6. Set the partition scheme to GUID.
7. Set the Format type to APFS (SSDs, only if installing Mojave or Catalina ) or Mac OS Extended, (Journaled.)
8. Click on the Apply button, then click on the Done button when it activates.
9. Quit Disk Utility and return to the Utility Menu.
10. Select Install OS X and click on the Continue button.

This should install the version of OS X that came pre-installed from the factory.

It is a regular installer but one that does not require a connection to Apple or an optical drive. However, it still may need to download a small number of support files needed to make the flash drive bootable. The flash drive installer can not be converted as-is to the regular installer application from which it was made.

Well, you will need to find a Mavericks installer in order to make a USB flash drive installer. To make your own bootable installer, see How to create a bootable installer for macOS.