speckled trout vs trout

speckled trout and trout both are nouns.

Word	Noun	Adjective	Verb	Adverb
speckled trout	Yes	No	No	No
trout	Yes	No	No	No

As nouns, trout is a hypernym of speckled trout; that is, trout is a word with a broader meaning than speckled trout:

speckled trout: North American freshwater trout; introduced in Europe
trout: any of various game and food fishes of cool fresh waters mostly smaller than typical salmons

speckled trout (noun)	trout (noun)
North American freshwater trout; introduced in Europe	any of various game and food fishes of cool fresh waters mostly smaller than typical salmons
a delicious freshwater food fish	flesh of any of several primarily freshwater game and food fishes