guiding light vs luminary

guiding light and luminary both are nouns.

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

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

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

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