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The reason why people often confuse the spellings "espresso" and "expresso" may be due to a combination of factors. First, the word "espresso" is of Italian origin, and the letter "s" is pronounced differently in Italian than in English. In Italian, the letter "s" is pronounced as a "z" sound, while in English it is pronounced as an "s" sound. This may lead some people to think that the word is spelled with an "x" instead of an "s." Second, the letter combination "es" followed by the letter "s" is not common in English words, which may make the spelling "expresso" seem more intuitive to some English speakers. Finally, it is possible that the misspelling of "expresso" has become common over time due to frequent use and repetition, even though it is technically incorrect.

Coffee beans are the pits of the cherry-like berries that grow on the coffee plant, and they are usually roasted to bring out their flavor and aroma before being used to make coffee. While they are commonly referred to as "beans," coffee beans are not actually a true legume or bean, which belong to the family Fabaceae. Instead, coffee beans belong to the family Rubiaceae and are classified as a fruit called a "drupe." Nevertheless, they are commonly referred to as beans due to their bean-like shape and size.