NNE vs north northeast

NNE and north northeast both are nouns.

Word	Noun	Adjective	Verb	Adverb
NNE	Yes	No	No	No
north northeast	Yes	No	No	No

As nouns, NNE and north northeast are synonyms defined as:

NNE and north northeast: the compass point that is midway between north and northeast

Other synonyms of NNE include nor'-nor'-east.

NNE (noun)	north northeast (noun)
the compass point that is midway between north and northeast	the compass point that is midway between north and northeast