efflorescence vs skin rash

efflorescence and skin rash both are nouns.

Word	Noun	Adjective	Verb	Adverb
efflorescence	Yes	No	No	No
skin rash	Yes	No	No	No

As nouns, efflorescence and skin rash are synonyms defined as:

Other synonyms of efflorescence include rash, roseola.

efflorescence (noun)	skin rash (noun)
a powdery deposit on a surface	any red eruption of the skin
the time and process of budding and unfolding of blossoms
any red eruption of the skin
the period of greatest prosperity or productivity