"super user"/"superuser" should be mostly avoided; replace with "administrator"/administrative privileges
"superuser" appear 1 time and "super user" appear 2 times in translations:
https://gitlab.gnome.org/GNOME/gnome-user-docs/-/blob/master/gnome-help/C/sound-nosound.page#L125 https://gitlab.gnome.org/GNOME/gnome-user-docs/-/blob/master/gnome-help/C/user-admin-explain.page#L65 https://gitlab.gnome.org/GNOME/gnome-user-docs/-/blob/master/gnome-help/C/user-admin-explain.page#L69
<p>Run <cmd>lspci</cmd> as <link xref="user-admin-explain">superuser</link>;
<title>What does “super user” mean?</title>
<cmd>sudo</cmd>; these are programs for temporarily giving you “super user”
So guess they should either one or the other for consistency. I will let other decide the correct way to write it.