salmon trout vs Salvelinus namaycush

salmon trout and Salvelinus namaycush both are nouns.

Word	Noun	Adjective	Verb	Adverb
salmon trout	Yes	No	No	No
Salvelinus namaycush	Yes	No	No	No

As nouns, salmon trout and Salvelinus namaycush are synonyms defined as:

salmon trout and Salvelinus namaycush: large fork-tailed trout of lakes of Canada and the northern United States

Other synonyms of salmon trout include lake trout.

salmon trout (noun)	Salvelinus namaycush (noun)
large fork-tailed trout of lakes of Canada and the northern United States	large fork-tailed trout of lakes of Canada and the northern United States
speckled trout of European rivers; introduced in North America
flesh of marine trout that migrate from salt to fresh water