Blennioid and Prickleback

Blennioid noun - Elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins.

Prickleback and blennioid are semantically related. In some cases you can replace term "Prickleback" with "Blennioid", this nouns are similar.

Prickleback noun - Small elongate fishes of shallow northern seas; a long dorsal fin consists entirely of spines.

Blennioid and prickleback are semantically related. You can use "Blennioid" instead a noun "Prickleback".