The Spanish word 'brújula' (meaning 'compass') has an interesting journey from ancient Greek through Italian. It starts with the Greek word 'pyxis' (πυξίς), which simply meant 'box'. This evolved into the Vulgar Latin 'buxida', still meaning 'small box'. The word then made its way into Italian as 'bussola', where it specifically came to refer to a compass (while retaining the connection to its 'small box' meaning, as early compasses were housed in small boxes). Finally, the word was borrowed into Spanish as 'brújula', maintaining its meaning as a navigational compass.

While 'brújula' itself is a relatively common Spanish word, it doesn't have many closely related words in modern Spanish that would be simpler for students to recognize. The word stands somewhat alone in Spanish vocabulary, having been borrowed as a complete term from Italian.

English speakers might recognize a connection to the word 'box', though this connection is quite distant. More directly related is the English word 'pyx', which comes from the same Greek root 'pyxis' and refers to a small container, particularly one used in churches to hold the consecrated Host. The scientific term 'pyxis' is also used in biology and astronomy, maintaining its original meaning of a box-like structure.