Echinoderm and Invertebrate

Echinoderm noun - Marine invertebrates with tube feet and five-part radially symmetrical bodies.

Invertebrate and echinoderm are semantically related. In some cases you can use "Invertebrate" instead a noun "Echinoderm".

Invertebrate noun - Any animal lacking a backbone or notochord; the term is not used as a scientific classification.

Echinoderm and invertebrate are semantically related. Sometimes you can replace term "Echinoderm" with "Invertebrate", this nouns are similar.