Prosperity
noun, な adjective, の adjective
Prosperity in piles is a lot of prosperity!
りゅうせい
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
アメリカで最も隆盛を極めて入る州は何州ですか。
Which state is the most prosperous in the U.S.?