The Spanish word 'morocha', meaning 'dark-haired' or 'brunette', comes from the Quechua word 'muruch'u', which referred to a variety of hard, dark-colored corn. This is a fascinating example of how words can evolve from describing physical characteristics of plants to human features. The semantic shift from the dark color of the corn variety to describing dark hair in humans shows how indigenous American vocabulary has been adapted and integrated into Spanish, taking on new but related meanings.

While 'morocha' itself is a relatively common word in Latin American Spanish, particularly in Argentina and Uruguay, there aren't many simpler or more common Spanish words that share its Quechua etymology. This is because it comes directly from an indigenous American language rather than from Latin or Greek roots that are more common in Spanish vocabulary.

There aren't any common English words directly related to 'morocha' since it comes from Quechua, an indigenous South American language family that had no contact with English until relatively recent times. English speakers might find it helpful instead to remember that 'morocha' refers to dark hair, similar to how we might use 'brunette' in English.