limelight vs calcium light

limelight and calcium light both are nouns.

Word	Noun	Adjective	Verb	Adverb
limelight	Yes	No	No	No
calcium light	Yes	No	No	No

As nouns, limelight and calcium light are synonyms defined as:

limelight and calcium light: a lamp consisting of a flame directed at a cylinder of lime with a lens to concentrate the light; formerly used for stage lighting

limelight (noun)	calcium light (noun)
a lamp consisting of a flame directed at a cylinder of lime with a lens to concentrate the light; formerly used for stage lighting	a lamp consisting of a flame directed at a cylinder of lime with a lens to concentrate the light; formerly used for stage lighting
a focus of public attention