salmon trout vs lake trout

salmon trout and lake trout both are nouns.

Word	Noun	Adjective	Verb	Adverb
salmon trout	Yes	No	No	No
lake trout	Yes	No	No	No

As nouns, salmon trout and lake trout are synonyms defined as:

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

Other synonyms of salmon trout include Salvelinus namaycush.

salmon trout (noun)	lake trout (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 large trout of northern lakes
flesh of marine trout that migrate from salt to fresh water