The Spanish word 'carancho' comes from the Tupi-Guarani word 'caracara', which is an onomatopoeic term imitating the distinctive cry of this bird of prey. The caracara is a type of falcon native to the Americas, and its name in indigenous languages reflects the sound it makes. The Spanish adaptation 'carancho' shows how the original indigenous word was modified to fit Spanish phonological patterns, with the final syllable changing from '-ra' to '-cho'.

Since 'carancho' comes directly from an indigenous American language and underwent unique sound changes when adopted into Spanish, there aren't any simpler or more common Spanish words that share its etymology.

The English word 'caracara' is directly borrowed from the same Tupi-Guarani source as Spanish 'carancho'. In English, we kept the original repetitive sound pattern of the indigenous word 'caracara', while Spanish modified it. Both words refer to the same type of bird of prey, just with slightly different forms in each language.