* Etymology is the study of the origin and history of words.
* Entomology is the study of insects.
It's easy to get these two confused because "entomo-" comes from the Greek word "éntomon," meaning "insect." However, the "etym-" in etymology comes from the Greek word "étymon," meaning "true," or "real."
So, next time you want to know how a word got its meaning, you'll be looking to etymology, not entomology!