Cacher is the code snippet organizer for pro developers

simply put,

break exits a loop,
return exits a function.

That is too much simplified.

For the `break' statement may also occur outside of loops (i.e. `for',
for..in, do..while, and while..do statements followed by an execution
block), in the `switch' statement where it prevents execution from
considering the following `case' statements or the following `default'
statement within that `switch' statement.

Also, `break' does not return a value. `return', which exits the current
local execution context (the current function), does (if not explicitly
stated, it returns `undefined' from that context implicitly).