SSE vs south southeast

SSE and south southeast both are nouns.

Word	Noun	Adjective	Verb	Adverb
SSE	Yes	No	No	No
south southeast	Yes	No	No	No

As nouns, SSE and south southeast are synonyms defined as:

SSE and south southeast: the compass point midway between south and southeast

Other synonyms of SSE include sou'-sou'-east.

SSE (noun)	south southeast (noun)
the compass point midway between south and southeast	the compass point midway between south and southeast