social climber vs arriviste

social climber and arriviste both are nouns.

Word	Noun	Adjective	Verb	Adverb
social climber	Yes	No	No	No
arriviste	Yes	No	No	No

As nouns, arriviste is a hypernym of social climber; that is, arriviste is a word with a broader meaning than social climber:

social climber: someone seeking social prominence by obsequious behavior
arriviste: a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class

Other hypernyms of social climber include nouveau-riche, parvenu, upstart.

social climber (noun)	arriviste (noun)
someone seeking social prominence by obsequious behavior	a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class