The Spanish word 'huipil' comes directly from the Nahuatl (Aztec) word 'huipilli', meaning 'blouse'. This is one of many words that Spanish borrowed from indigenous Mexican languages after the Spanish conquest of the Aztec Empire. The word refers specifically to a traditional garment - a loose-fitting sleeveless blouse or tunic traditionally worn by indigenous women in Mexico and Central America, often decorated with colorful embroidery, patterns, and designs.

Since 'huipil' comes from Nahuatl rather than Latin or Greek roots, there aren't many etymologically related simpler Spanish words. It stands relatively isolated in Spanish vocabulary as a direct borrowing from an indigenous American language.

The word 'huipil' has been borrowed into English with the same meaning as in Spanish, though it's primarily used when specifically discussing traditional Mexican and Central American clothing. There aren't any commonly used English words that share its etymology, as it comes from Nahuatl rather than the Indo-European roots that most English words derive from.