trumpeter swan vs trumpeter

trumpeter swan and trumpeter both are nouns.

Word	Noun	Adjective	Verb	Adverb
trumpeter swan	Yes	No	No	No
trumpeter	Yes	No	No	No

As nouns, trumpeter swan and trumpeter are synonyms defined as:

trumpeter swan and trumpeter: large pure white wild swan of western North America having a sonorous cry

Other synonyms of trumpeter swan include Cygnus buccinator.

trumpeter swan (noun)	trumpeter (noun)
large pure white wild swan of western North America having a sonorous cry	large gregarious crane-like bird of the forests of South America having glossy black plumage and a loud prolonged cry; easily domesticated
	large pure white wild swan of western North America having a sonorous cry
	a musician who plays the trumpet or cornet
	(formal) a person who announces important news