luminary vs guiding light

luminary and guiding light both are nouns.

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

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

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

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