A word rich has numerous meanings:

Wealthy: "Bill Gates is a rich man." With lots of natural resources: "Alaska is rich in oil." Elaborate or even luxurious: "That was a very rich banquet." Existence of dependable or even heavy qualities, flavours, or ingredients: "The chocolate cake was very rich." To the full, deep, mellowly or even intense: "The painter used a very rich palette." Super amusing or even absurd (Slang): "Give you $20? Yeah, that's rich." Rich people may be short for the title Richard. Rich people's potty refer to Rich Products Corporation.