NNW vs north northwest

NNW and north northwest both are nouns.

Word	Noun	Adjective	Verb	Adverb
NNW	Yes	No	No	No
north northwest	Yes	No	No	No

As nouns, NNW and north northwest are synonyms defined as:

NNW and north northwest: the compass point that is midway between north and northwest

Other synonyms of NNW include nor'-nor'-west.

NNW (noun)	north northwest (noun)
the compass point that is midway between north and northwest	the compass point that is midway between north and northwest