The Spanish word 'corredor' (meaning 'runner') comes from combining the verb 'correr' ('to run') with the agent suffix '-dor'. The verb 'correr' itself derives from the Latin verb 'currere', which also meant 'to run'. The suffix '-dor' is added to verbs to create nouns that describe someone or something that performs the action of the verb - in this case, someone who runs.

The most obvious related Spanish word is the verb 'correr' (to run), which is much more common and basic than 'corredor'. You'll also find this root in words like 'corretear' (to run around), 'corrida' (a run or race), and 'corriente' (current, running).

Several English words share the same Latin root 'currere'. The most common ones include 'current' (like a running stream), 'course' (a path that one runs along), 'courier' (someone who runs messages), and 'corridor' (a running passageway). The word 'curriculum' also comes from this root, originally meaning 'a running, course of study'.