prickly heat vs efflorescence

prickly heat and efflorescence both are nouns.

Word	Noun	Adjective	Verb	Adverb
prickly heat	Yes	No	No	No
efflorescence	Yes	No	No	No

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

Other hypernyms of prickly heat include rash, roseola, skin rash.

prickly heat (noun)	efflorescence (noun)
obstruction of the sweat ducts during high heat and humidity	a powdery deposit on a surface
	the time and process of budding and unfolding of blossoms
	any red eruption of the skin
	the period of greatest prosperity or productivity