Panoply: A full collection or array of something {impressive}. (n)

This word is probably one of the easier words to incorporate into your vocabulary...... so share what panoplies in the comments below!

   Gaucherie: an act or movement that is socially awkward or embarrassing (n)

   Now this word is pronounced in a way you probably won't guess just by looking at it. Its pronounced like "Go-shuh-ree". 
   Well.... I think it is safe to say that we have all made Gaucheries...  Tell us what kind of Gaucherie that you have made in the comments!

Mizzle: Light rain; drizzle (n)

So, instead of saying: "Hey! Its drizzling outside", you can say: "Hey! Its Mizzling outside!" 
Just Kidding, I don't specifically know in which context you may use this word in :) Isn't this word convenient? :P 

Vicennial: happening every 20 years (n)