The Spanish word 'aguileño' (meaning 'aquiline' or 'eagle-like') comes from combining two elements: the Spanish word 'águila' (meaning 'eagle') and the suffix '-eño' (which indicates resemblance or similarity). The word 'águila' itself derives from the Latin word 'aquila', meaning 'eagle'. The suffix '-eño' was added to create an adjective describing something that resembles or has characteristics of an eagle, particularly referring to a nose shape that is curved like an eagle's beak.

The most obvious related Spanish word is 'águila' (eagle), which is a more common and simpler word that Spanish learners often encounter early in their studies. While 'águila' refers to the bird itself, 'aguileño' describes something (usually a facial feature) that resembles characteristics of an eagle.

The English word 'aquiline' is a direct cognate of 'aguileño', as both come from the Latin 'aquila'. In English, 'aquiline' is most commonly used in the phrase 'aquiline nose' to describe a nose that is curved or hooked like an eagle's beak. The English word 'eagle' itself is also related, though it came to English through a different path - through Old French 'aigle', which also descended from Latin 'aquila'.