Phasmid and Stick insect

Phasmid noun - Large cylindrical or flattened mostly tropical insects with long strong legs that feed on plants; walking sticks and leaf insects.

Stick insect and phasmid are semantically related. In some cases you can replace phrase "Stick insect" with "Phasmid", this terms are similar.

Stick insect noun - Any of various mostly tropical insects having long twiglike bodies.

Phasmid and stick insect are semantically related. You can use "Phasmid" instead a noun phrase "Stick insect".