Southern Triangle vs constellation

Southern Triangle and constellation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Southern Triangle	Yes	No	No	No
constellation	Yes	No	No	No

Southern Triangle (noun)	constellation (noun)
a small bright constellation in the polar region of the Southern Hemisphere near Circinus and Apus	an arrangement of parts or elements
	a configuration of stars as seen from the earth