"Newly rich" is a term that describes someone who has recently acquired a substantial amount of wealth. This person may have come into a large inheritance or made a significant business deal that has brought in a massive amount of money. There are many other terms that can be used to describe someone who is newly rich. Some of these synonyms include "nouveau riche," "suddenly affluent," "overnight millionaire," "parvenu," "upstart," among others. Each of these phrases has a slightly different connotation, but they all describe someone who has recently come into a lot of money and may be adjusting to their new lifestyle and expectations.