campanero
bell-ringer
campana
bell
+
-ero
person who does something
Campanero means bell-ringer and can be broken down into campana0 (bell0) and -ero1 (person who does something1), literally meaning 'a person who works with bells'.
noun
- bell-ringerA person who rings bells, especially in a churchEl campanero toca las campanas todos los domingos. // The bell-ringer rings the bells every Sunday.