Choose the word which is different from the rest.

The answer is D, aphid.

Aphids are small, soft-bodied insects that feed on the sap of plants. They are considered pests because they can damage plants by sucking their juices.

Moth, bee, and cockroach are all insects that have six legs and three body parts. They are also all winged.

Lizard is a reptile that has four legs and a long tail. It is not an insect.

Aphids are different from the other options because they are not insects. They are in the order Hemiptera, which also includes true bugs, such as cicadas and leafhoppers.