Why does a programming language need keywords?

Question

For example (in C):

int break = 1;
int for = 2;

Why will the compiler have any problems at all in deducing that break and fo

Answer 1

Then what will the computer do when it comes across a statement like:

while(1) {
  ...
  if (condition)
    break;
}

Should it actually break? Or should it treat it as 1;?

The language would become ambiguous in certain cases, or you'd have to create a very smart parser that can infer subtle syntax, and that's just unnecessary extra work.