A person who arbitrarily laces their writing with high-register words, usually but not necessarily with the assistane of a thesaurus, in a way which is intended to impress the reader but does not actually add to the content or depth of the text.
"Hey, does anyone know a synonym of 'blah' that sounds more intellectual?" - Thewhoraus
"Does he think I'm that stupid? Replacing words with thesaurus entries is the oldest trick in the book." - A thewhoraus's English teacher