Thread - contention vs race

Question

The terms contention and race are used interchangeably when it comes to thread's state(at critical section). Are they same?

Answer 1

These are two distinct phenomena. Contention refers to the fact that when thread $A$ has accessed a resource $B$ needs to wait until $A$ frees it.

Race refers to the fact when both threads $A$ and $B$ want to secure access to a resource. The fastest will secure it and thus lead to contention.