polysillybic 

A person who habitually favours a long word over a short one.

That polysillybic? Just a long-word factory. Sometimes he can't even get his tongue around the pronunciation!

polysillybic by vivauganda January 14, 2011

Polysyllabophile 

(n)
1. One who loves large words
2. One who cannot gain sexual satisfaction without the use of large words.

Bill was quite aroused, but as a polysyllabophile could not climax until his lover uttered the word epicaricacy.

Polysyllabophile by Blue_Baller August 30, 2012