Which of the following is a synonym for insect?

The choice of "Bug" as a synonym for insect is accurate because the word "bug" is commonly used to refer to a wide variety of insects. In colloquial language, people often use “bug” to indicate insects in general, encompassing creatures such as beetles, flies, and more. This reflects a general understanding of the term within everyday contexts, even though scientifically, "bug" specifically refers to a certain order within the class Insecta, known as Hemiptera, which includes true bugs like aphids and cicadas.

In contrast, the other options are not appropriate synonyms. "Abeille," which means "bee" in French, refers specifically to a particular group of insects and does not cover the broader category of all insects. "Bird" refers to a completely different class of vertebrates that have feathers, wings, and are not at all related to insects. Lastly, "Animal" is an even broader category that includes all animals – both invertebrates and vertebrates – and does not specifically refer to insects, making it too general to function as a synonym. Thus, "Bug" stands out as the most fitting synonym in this context.