Hogwartsesque

The first X-Men movie already showed a Hogwartsesque Xavier school, and I'm pretty sure that preceded any involvement by Morrison in the comics.

Source: wiktionary

Snobbery and sex are long-term inhabitants at Tatham’s – the arcane, Hogwartsesque institution based on Winchester College where Gale went to school.

Source: wiktionary

I am at pains to point out that he is going to a state school so any poshness is entirely free and unavoidable. Although it does have a separate manor house for the 6th formers which is a bit Hogwartsesque.

Source: wiktionary

The five sunny rooms overlook the manicured grounds; two are reached via a Hogwartsesque spiral staircase, and breakfast is served in the 16th-century dining hall with its original stone hearth and Victorian range.

Source: wiktionary