pretentious vs upstart

pretentious is not a noun while upstart is a noun.

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

pretentious (noun)	upstart (noun)
	a gymnastic exercise performed starting from a position with the legs over the upper body and moving to an erect position by arching the back and swinging the legs out and down while forcing the chest upright
	a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class
	an arrogant or presumptuous person

pretentious (adjective)	upstart (adjective)
making claim to or creating an appearance of (often undeserved) importance or distinction	characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position
intended to attract notice and impress others
(of a display) tawdry or vulgar