Lancetfish and Wolf fish

Lancetfish noun - Large elongate scaleless oceanic fishes with sharp teeth and a long dorsal fin that resembles a sail.

Wolf fish and lancetfish are semantically related. In some cases you can replace phrase "Wolf fish" with "Lancetfish", this terms are similar.

Wolf fish noun - Large ferocious northern deep-sea food fishes with strong teeth and no pelvic fins.

Lancetfish and wolf fish are semantically related. You can use "Lancetfish" instead a noun phrase "Wolf fish".