The Spanish word 'buzo' (meaning 'diver') has an interesting journey through ancient languages. It starts with the Ancient Greek word 'bous' meaning 'ox', which influenced the Latin word 'bucina', referring to a 'herdsman's horn' (likely named because these horns were originally made from ox horns). This evolved into the Portuguese word 'búzio', which meant 'sea snail' or 'diving shell', probably because these shells resembled the shape of the horns. Finally, this gave rise to the Spanish 'buzo', shifting meaning to refer to a person who dives, perhaps because of the association with creatures that go underwater like sea snails.

While 'buzo' itself is a relatively common Spanish word, there aren't many simpler or more common Spanish words that share its exact etymology. However, Spanish speakers might encounter related terms like 'bucear' (to dive) which is derived from 'buzo'.

While there aren't many common English words directly related to 'buzo', English speakers might be interested to know that the word 'bovine' (relating to cattle) comes from the same Greek root 'bous' meaning 'ox'. The word 'bugle' (a musical instrument) is also distantly related, as it comes from the Latin 'bucina', showing a similar connection to horn instruments.