Anthozoa and Actinozoan

Anthozoa noun - A large class of sedentary marine coelenterates that includes sea anemones and corals; the medusoid phase is entirely suppressed.

Actinozoan and anthozoa are semantically related. In some cases you can replace term "Actinozoan" with "Anthozoa", this nouns are similar.

Actinozoan noun - Sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed.

Anthozoa and actinozoan are semantically related. You can use "Anthozoa" instead a noun "Actinozoan".