周末=weekend，周遭=the environment around you。周遭 is commonly used in written Chinese, not oral.

周末=周＋末。周means week, 末 means the end.周末means the weekend. 周遭 is similar to 周围，means the environment around you.

周末means weekend，周遭means around

周遭 is used less colloquial than 周围.

周遭口语里面不用，通常书面里会用到。