Salmon trout and Trout

Salmon trout noun - Large fork-tailed trout of lakes of Canada and the northern United States.

Trout and salmon trout are semantically related. In some cases you can use "Trout" instead a noun phrase "Salmon trout".

Trout noun - Any of various game and food fishes of cool fresh waters mostly smaller than typical salmons.

Salmon trout and trout are semantically related. Sometimes you can replace phrase "Salmon trout" with "Trout", this terms are similar.