illustrious vs famous

illustrious and famous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
illustrious	No	Yes	No	No
famous	No	Yes	No	No

As adjectives, illustrious and famous are synonyms defined as:

Other synonyms of illustrious include celebrated, famed, far-famed, notable, noted, renowned.

illustrious (adjective)	famous (adjective)
having or conferring glory	widely known and esteemed
widely known and esteemed