The term is never brought up in the MCU.
I kinda like Avenger's campus but I think Headquarters would've been cooler. It would have to be themed differently though, with probably more of an "open house" type deal where the headquarters is open for guests for a day to look around and see what the avengers are up to. They could still have the spiderman ride but would have to do some re-theming to fit the area. They could still do the same experiences as AC but each experience would be set in the characters "space" of the headquarters.
Avengers Compound would sound too... not fun. Could do Avengers Base but that also kinda sounds weird. Idk, maybe everything kinda sounds weird and Disney was at a lose-lose situation
anyone else come up with a better idea?