The difference between Big name and Luminary
When used as nouns, big name means a widely-known reputation, especially one that is favorable, whereas luminary means one who is an inspiration to others.
check bellow for the other definitions of Big name and Luminary
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Big name as a noun (idiomatic):
A widely-known reputation, especially one that is favorable.
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Big name as a noun (idiomatic):
A prominent individual, especially one who is favorably regarded.
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Luminary as a noun:
One who is an inspiration to others; one who has achieved success in their chosen field; a leading light.
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Luminary as a noun (archaic):
A body that gives light; especially, one of the heavenly bodies.
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Luminary as a noun (archaic):
An artificial light; an illumination.