Sesquipedalian
Part of speech: noun
Definition: A person who uses long words. A long word.
Part of speech: adjective
Definition: long; polysyllabic. Pertaining to or given to the use of overly long words.
Polysyllabic
Part of speech: adjective
Definition: Having more than one syllable; having multiple or many syllables.Characterized by or consisting of words having numerous syllables.
Part of speech: noun
Definition: a word having more than one syllable