The term "peanut" is indeed a bit misleading, as peanuts are not actually true nuts. Instead, they belong to the legume family, which also includes beans, lentils, and peas. True nuts, such as almonds, cashews, and walnuts, develop from a hard shell that encloses a seed.
It's important to note that guinea pigs are not related to pigs biologically. They belong to the rodent family, and their closest wild relatives are found in South America. The name "guinea pig" has simply persisted over time due to historical usage and familiarity, even though it may not accurately reflect their true nature.
This phenomenon happens in other languages around the world!
Book in Video:
"When Languages Die"
K. David Harrison