The Spanish word 'profe' is a casual, shortened form of 'profesor' (teacher), which comes from the Latin word 'professor' meaning 'one who professes' or 'teacher'. The Latin 'professor' was formed by combining three elements: the prefix 'pro-' meaning 'forward, in front', the verb 'fateri' meaning 'to confess or admit', and the agent suffix '-or' which indicates the person who does the action. So literally, a 'professor' was someone who 'declares things publicly' or 'speaks forth', which evolved to mean a teacher or instructor.

The most common related Spanish word is the full form 'profesor/profesora', which is the standard word for 'teacher' or 'professor'. 'Profe' is simply an informal shortening of this word, much like how English speakers might say 'prof' instead of 'professor'.

The English word 'professor' is directly related to Spanish 'profe', as both come from the same Latin root 'professor'. English also has related words like 'profess' (to declare publicly), 'profession' (a declared occupation), and 'professional' (someone who does something as a profession), all sharing the same Latin ancestry. The connection between 'teaching' and 'declaring/professing' is preserved in both languages.