There’s rich, there’s filthy rich, and then there’s crazy rich.

[sitifan]

“There’s rich, there’s filthy rich, and then there’s crazy rich.” —People
https://www.sanmin.com.tw/product/index/006906544
Is the word "rich" a noun in the above quotation?

 

[teechar]

No, it's an adjective. The sentence is saying there are higher and higher levels of being rich.