pyramids

a polyhedron having a polygonal base and triangular sides with a common vertex
(stock market) a series of transactions in which the speculator increases his holdings by using the rising market value of those holdings as margin for further purchases
a massive monument with a square base and four triangular sides; begun by Cheops around 2700 BC as royal tombs in ancient Egypt
enlarge one's holdings on an exchange on a continued rise by using paper profits as margin to buy additional amounts
use or deal in (as of stock or commercial transaction) in a pyramid deal
arrange or build up as if on the base of a pyramid
increase rapidly and progressively step by step on a broad base

pyramids is a valid Scrabble (US) TWL word

pyramids is a valid Scrabble Word in Merriam-Webster MW Dictionary

pyramids is a valid Scrabble Word in International Collins CSW Dictionary

pyramids is a valid Words With Friends word