great white hope vs white hope

great white hope and white hope both are nouns.

Word	Noun	Adjective	Verb	Adverb
great white hope	Yes	No	No	No
white hope	Yes	No	No	No

As nouns, great white hope and white hope are synonyms defined as:

great white hope and white hope: someone (or something) expected to achieve great success in a given field

great white hope (noun)	white hope (noun)
someone (or something) expected to achieve great success in a given field	someone (or something) expected to achieve great success in a given field