whooper swan vs whooper

whooper swan and whooper both are nouns.

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

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

whooper swan and whooper: common Old World swan noted for its whooping call

Other synonyms of whooper swan include Cygnus cygnus.

whooper swan (noun)	whooper (noun)
common Old World swan noted for its whooping call	common Old World swan noted for its whooping call
	rare North American crane having black-and-white plumage and a trumpeting call