I don't think different types of sentience exist? Either something is sentient or isn't. I know aliens are only fiction (though in the huge galaxy not necessari

I don't think different types of sentience exist? Either something is sentient or isn't. I know aliens are only fiction (though in the huge galaxy not necessarily fiction, just not reachable), but do you consider non-human civilizations on other planets also a different kind of sentience because they're not human?