Lancet fish and Soft-finned fish

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

Soft-finned fish and lancet fish are semantically related. In some cases you can use "Soft-finned fish" instead a noun phrase "Lancet fish".

Soft-finned fish noun - Any fish of the superorder Malacopterygii.

Lancet fish and soft-finned fish are semantically related. Sometimes you can replace phrase "Lancet fish" with "Soft-finned fish", this phrases are similar.