Blenny and Blennioid fish

Blenny noun - Small usually scaleless fishes with comb-like teeth living about rocky shores; are territorial and live in holes between rocks.

Blennioid fish and blenny are semantically related. In some cases you can use "Blennioid fish" instead a noun "Blenny".

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

Blenny and blennioid fish are semantically related. Sometimes you can replace term "Blenny" with "Blennioid fish", this terms are similar.