Billfish and Scombroid

Billfish noun - Giant warm-water game fish having a prolonged and rounded toothless upper jaw.

Scombroid and billfish are semantically related. In some cases you can use "Scombroid" instead a noun "Billfish".

Scombroid noun - Important marine food and game fishes found in all tropical and temperate seas; some are at least partially endothermic and can thrive in colder waters.

Billfish and scombroid are semantically related. Sometimes you can replace term "Billfish" with "Scombroid", this nouns are similar.