I see in my cPanel there is a (yuck!!) an option to install Wordpress (I would rather install a rather large corn cob, sideways!), so I assume (and no I will not click install to find out!), that there must also be a 'uninstall' button. But this is insidious Wordpress we are talking about.... so at a push I would back up my files and reset cpanel.
The reset button is besides the manage button (too temptingly close sometimes).