To those who might not be aware: Wine originally stood for "Wine is not an emulator", a recursive acronym that were popular in the geek culture a few decades ago. Same for KDE Desktop Environment and GNU's not Unix.
I guess this falls under "other features" but it's pretty common to emulate systems behavior via a re-implementation, or thunking calls to a copy of the original libraries, etc.
Oracle uses the verb "emulate" to describe branded zones, which function similarly, as well. I think it's semantically fine to call this emulation, it's just high-level emulation.
