Seward's Folly vs Alaska Purchase

Seward's Folly and Alaska Purchase both are nouns.

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

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

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

Seward's Folly (noun)	Alaska Purchase (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