Ontology: A list of words that make you sound smart. Epistemology: A study of what we know, and why we know it. Metaphysics: The study of what's behind the curtains. Axiology: A branch of philosophy concerned with the nature of value and the good. Teleology: A study of the purpose or goal of life. Semantics: A study of meaning and signification. Praxeology: The economics of human behavior. Ethology: The study of human ethics.