WORDS I WISH I COULD USE CORRECTLY

We have so many cool words in the English language. Some are just innately cool whether I know how to use them in context or not. Here are some I would like to use correctly...even though using them would make me sound pretentious.
  1. Eponymous
  2. Schadenfreude
  3. Erstwhile
  4. Vis a vis
  5. Scion