Theoretical
Part of speech: adjective
Definition: of or pertaining to theoretic studies (abstract, not empirical)
Hypothetical
Part of speech: adjective
Definition: Based upon a hypothesis; conjectural
Part of speech: noun
Definition: A hypothetical situation or proposition
Example sentence: There's an academic tradition called the 'Last Lecture.' Hypothetically, if you knew you were going to die and you had one last lecture, what would you say to your students? Well, for me, there's an elephant in the room. And the elephant in the room, for me, it wasn't hypothetical.