luminary vs leading light

luminary and leading light both are nouns.

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

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

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

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