Alaska Purchase vs Seward's Folly

Alaska Purchase and Seward's Folly both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alaska Purchase	Yes	No	No	No
Seward's Folly	Yes	No	No	No

As nouns, Alaska Purchase and Seward's Folly are synonyms defined as:

Alaska Purchase and Seward's Folly: the transaction in 1867 in which the United States Secretary of State William Henry Seward purchased Alaska from Russia

Alaska Purchase (noun)	Seward's Folly (noun)
the transaction in 1867 in which the United States Secretary of State William Henry Seward purchased Alaska from Russia	the transaction in 1867 in which the United States Secretary of State William Henry Seward purchased Alaska from Russia