Old Glory vs Star-Spangled Banner

Old Glory and Star-Spangled Banner both are nouns.

Word	Noun	Adjective	Verb	Adverb
Old Glory	Yes	No	No	No
Star-Spangled Banner	Yes	No	No	No

As nouns, Old Glory and Star-Spangled Banner are synonyms defined as:

Old Glory and Star-Spangled Banner: the national flag of the United States of America

Other synonyms of Old Glory include American flag, Stars and Stripes.

Old Glory (noun)	Star-Spangled Banner (noun)
the national flag of the United States of America	the national flag of the United States of America