Parvenu partially coincident with nouveau riche
A parvenu is a person who is a relative newcomer to a high-ranking socioeconomic class. The word is borrowed from the French language; it is the past participle of the verb parvenir (to reach, to arrive, to manage to do something).Origin
The word parvenu typically describes a person who recently ascended the social ladder, especially a nouveau riche or "new money" individual.  The famous Margaret Brown, who survived the sinking of the Titanic in 1912, was portrayed as a "new money" individual, most notably in the "climbing social classes" musical The Unsinkable Molly Brown, because of her impoverished Irish immigrant roots and lack of social pedigree.
The Oxford English Dictionary defines a parvenu as: "A person from a humble background who has rapidly gained wealth or an influential social position; a nouveau riche; an upstart, a social climber. Also in extended use. Generally used with the implication that the person concerned is unsuited to the new social position, esp. through lacking the necessary manners or accomplishments."
The term designates individuals not socially accepted by individuals already established in their new class. It expresses a form of classism.
partially overlapping with partially intersecting with partially sharing with partially matching with partially aligning with