In our village (barangay), common people will call anyone who who preaches a "pastor". If they hear a deacon preach, they would call him "pastor". If they hear one of our young men preach, they would call him "pastor". If they see a male church member wearing his shirt tucked in and holding a Bible in his hand, they would call him "pastor". Even when we play basketball, a faithful church member with a head that looks almost bald is called "pastor".
I guess, a "pastor" is someone who preaches and looks like a pastor.