leading light vs luminary

leading light and luminary both are nouns.

Word	Noun	Adjective	Verb	Adverb
leading light	Yes	No	No	No
luminary	Yes	No	No	No

As nouns, leading light and luminary are synonyms defined as:

Other synonyms of leading light include guiding light, notability, notable.

leading light (noun)	luminary (noun)
a celebrity who is an inspiration to others	a celebrity who is an inspiration to others