Pile
Prosperous, Heap
セイ, ジョウ
も, さか
栄 (エイ、さか) Prosper, Flourish
盛 (セイ, ジョウ、も, さか) Pile, Prosperous, Heap
隆 (リュウ) Prosperity
昌 (ショウ、さかん) Prosperous, Prosperity
Heaps and Piles consist of Prosperous quantities.
The せい reading comes from 成