Scombroid fish and Tunny

Scombroid fish 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.

Tunny and scombroid fish are semantically related. In some cases you can replace term "Tunny" with "Scombroid fish", this terms are similar.

Tunny noun - Any very large marine food and game fish of the genus Thunnus; related to mackerel; chiefly of warm waters.

Scombroid fish and tunny are semantically related. You can use "Scombroid fish" instead a noun "Tunny".