golden age vs efflorescence

golden age and efflorescence both are nouns.

Word	Noun	Adjective	Verb	Adverb
golden age	Yes	No	No	No
efflorescence	Yes	No	No	No

As nouns, efflorescence is a hypernym of golden age; that is, efflorescence is a word with a broader meaning than golden age:

Other hypernyms of golden age include bloom, blossom, flower, flush, heyday, peak, prime.

golden age (noun)	efflorescence (noun)
any period (sometimes imaginary) of great peace and prosperity and happiness	a powdery deposit on a surface
a time period when some activity or skill was at its peak	the time and process of budding and unfolding of blossoms
	any red eruption of the skin
	the period of greatest prosperity or productivity