The Spanish word 'maní' (peanut) comes directly from the Taíno word 'mani' with the same meaning. Taíno was the principal language of the indigenous peoples of the Caribbean when Spanish colonizers arrived in the late 15th century. Many words for native American plants and foods, like 'maní', were borrowed from Taíno into Spanish during this period of contact.

Since 'maní' comes from Taíno rather than Latin or Greek roots, there aren't many etymologically related Spanish words. However, you might encounter compound words like 'mantequilla de maní' (peanut butter) or 'aceite de maní' (peanut oil).

There aren't any etymologically related English words since 'maní' comes from Taíno. The English word 'peanut' has a completely different etymology, being a compound of 'pea' and 'nut'. However, English has borrowed other Taíno words like 'hurricane' (from 'hurakán'), 'canoe' (from 'kanoa'), and 'barbecue' (from 'barbakoa').