chain command:
1) crats = "ascended" admins who can do what they want in theory BUT are still expected to do what admins do (run the wiki) they can be blocked or demoted by Fandom if they go insane / troublesome.. as stated above they technically don't report to anyone but Fandom can remove them if they become a problem : on most wikis (including this one) crats are also expected to work together, thus no single crat is "all-powerful" as other crats can undo their work (only Staff can demote a crat though).
2) admins = can block users, can do everything a Content Mod can do and are expected to run the wiki with help of crats and Content Mods, can be demoted by crats.. who they also usually report to (unless there's good reason not to)
3) Content Mods = can lock pages, delete/restore pages and so forth - they are expected to help clean up the wiki and keep it nice and ordered, the bigger the wiki the more Mods are needed and they report (usually) to admins.