Here's how it can be used:
* As an adjective: "Kanojo wa riek desu." (She is beautiful.)
* As a noun: "Rie wa hana no you da." (Her beauty is like a flower.)
"Rie" can also be a Japanese female given name.
If you meant "riek" as a misspelling, please provide more context to understand what you're asking. For example, is it a word from a specific language or a name?