upstart vs pretentious

upstart is a noun but pretentious is not a noun.

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

upstart (noun)	pretentious (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

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