I encounter the terms "world" and "universe" in various types of philosophy. I haven't paid close attention, but it seems "world" is used more phenomenologically and hence in Continental genres, where "universe" is used in physics as....I don't know, maybe the unity of a Newtonian spacetime of "all countable things." I really don't know.
So, my question is, are these formally defined in analytical philosophy? Which is the branch of philosophy that does formal definitions. I mean, is there some formal definition or some general distinction? And is there a difference in physics and Anglophone philosophy (not sure what else to call it now) between "many worlds" and "multiple universes," where the latter certainly seems self-contradictory.