Führer
B2 · noun · m
Führer (Adolf Hitler, during his time as chancellor of Nazi Germany)
Führer = führen (to lead) + -er, so literally a leader
German führen means to lead, and -er marks the person who does it, like English -er. In Spanish the word almost always refers to Hitler, whose title it was as head of Nazi Germany. In German, Reiseführer means travel guide.