pretentious vs sesquipedalian

pretentious is not a noun while sesquipedalian is a noun.

Word	Noun	Adjective	Verb	Adverb
pretentious	No	Yes	No	No
sesquipedalian	Yes	Yes	No	No

pretentious (noun)	sesquipedalian (noun)
	a very long word (a foot and a half long)

pretentious (adjective)	sesquipedalian (adjective)
making claim to or creating an appearance of (often undeserved) importance or distinction	(of words) long and ponderous; having many syllables
intended to attract notice and impress others	given to the overuse of long words
(of a display) tawdry or vulgar