Mount Godwin Austen vs K2

Mount Godwin Austen and K2 both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mount Godwin Austen	Yes	No	No	No
K2	Yes	No	No	No

As nouns, Mount Godwin Austen and K2 are synonyms defined as:

Mount Godwin Austen and K2: a mountain peak in the Karakoram Range in northern Kashmir; the 2nd highest peak in the world (28,250 feet high)

Other synonyms of Mount Godwin Austen include Dapsang, Godwin Austen.

Mount Godwin Austen (noun)	K2 (noun)
a mountain peak in the Karakoram Range in northern Kashmir; the 2nd highest peak in the world (28,250 feet high)	a mountain peak in the Karakoram Range in northern Kashmir; the 2nd highest peak in the world (28,250 feet high)