All about the delightful phenomenon of “Janus Words” — They’re called contronyms, antagonyms, auto-antonyms (shudder), and enantiodromes (fun!), but by far the nicest thing they’re called is “Janus Words,” after the (literally) two-faced Roman god Janus, who presided over doorways, gates, and transitions, looking backwards and forwards at the same time — just one of the many gnarly things…