Academe
Part of speech: noun
Definition: An academy; a place of learning. The scholarly life.
Academia
Part of speech: noun
Definition: The scientific and cultural community engaged in higher education and research, taken as a whole.
Example sentence: I came from a very small high school in which there was no guidance and not any appreciable amount of physics taught, nor much mathematics. So I didn't know what academia was all about until I got to college.