"raaw" is the usual verb to wait, like waiting for a bus. Together, raawkhay gives the sense of waiting for something longer, like waiting for a loved one to return home after serving overseas. "khay" by itself is not a common usage of the word, it sounds poetic and out of place.

(raww) and (khay) it's same meaning you can use two words. most people use the word " wait "

都一樣。都可以說 意義上無區別。