Arthropod and Xiphosurus polyphemus

Arthropod noun - Invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin.

Xiphosurus polyphemus and arthropod are semantically related. In some cases you can replace phrase "Xiphosurus polyphemus" with "Arthropod", this terms are similar.

Xiphosurus polyphemus noun - Large marine arthropod of the Atlantic coast of North America having a domed carapace that is shaped like a horseshoe and a stiff pointed tail; a living fossil related to the wood louse.

Arthropod and Xiphosurus polyphemus are semantically related. You can use "Arthropod" instead a noun phrase "Xiphosurus polyphemus".