age vs Jazz Age

age and Jazz Age both are nouns.

Word	Noun	Adjective	Verb	Adverb
age	Yes	No	Yes	No
Jazz Age	Yes	No	No	No

As nouns, Jazz Age is a hyponym of age; that is, Jazz Age is a word with a more specific, narrower meaning than age:

age: an era of history having some distinctive feature
Jazz Age: the 1920s in the United States characterized in the novels of F. Scott Fitzgerald as a period of wealth, youthful exuberance, and carefree hedonism

Other hyponyms of age include antiquity, golden age, reign, turn of the century, literary period.

age (noun)	Jazz Age (noun)
how long something has existed	the 1920s in the United States characterized in the novels of F. Scott Fitzgerald as a period of wealth, youthful exuberance, and carefree hedonism
a time of life (usually defined in years) at which some particular qualification or power arises
a late time of life
an era of history having some distinctive feature
a prolonged period of time