aurora borealis vs aurora

aurora borealis and aurora both are nouns.

Word	Noun	Adjective	Verb	Adverb
aurora borealis	Yes	No	No	No
aurora	Yes	No	No	No

As nouns, aurora is a hypernym of aurora borealis; that is, aurora is a word with a broader meaning than aurora borealis:

aurora borealis: the aurora of the Northern Hemisphere
aurora: an atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force

aurora borealis (noun)	aurora (noun)
the aurora of the Northern Hemisphere	an atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force
	the first light of day