The Spanish word 'tilma' comes directly from the Nahuatl (Aztec) word 'tilmatli', meaning 'cloak' or 'mantle'. This is one of many words that Spanish borrowed from the indigenous languages of Mexico during the colonial period. The tilma was a traditional garment worn by indigenous peoples of Mexico, most famously associated with the cloak of Juan Diego, which according to Catholic tradition bears the miraculous image of Our Lady of Guadalupe.

Since 'tilma' comes from Nahuatl rather than Latin or Greek roots, there aren't any simpler or more common Spanish words that share its etymology.

There aren't any common English words directly related to 'tilma' since it comes from Nahuatl. The word 'tilma' itself is sometimes used in English, particularly when discussing Mexican history or the story of Our Lady of Guadalupe, but it retains its Spanish meaning of a traditional Mexican cloak.