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Synonyms for Notable (same or very similar meaning)

WordNet sense 1 (a celebrity who is an inspiration to others):
luminary, notability, guiding light, leading light

WordNet sense 2 (worthy of notice):
noteworthy

WordNet sense 3 (having worth or merit or value; being honorable or admirable):
worthy

WordNet sense 4 (widely known and esteemed):
celebrated, famed, famous, illustrious, noted, renowned, far-famed

WordNet sense 5 (apprehended with certainty):
known


From the ODE community, based on WordNetadd/edit