cordon bleu vs blue ribbon

cordon bleu and blue ribbon both are nouns.

Word	Noun	Adjective	Verb	Adverb
cordon bleu	Yes	No	No	No
blue ribbon	Yes	No	No	No

As nouns, cordon bleu and blue ribbon are synonyms defined as:

cordon bleu (noun)	blue ribbon (noun)
an honor or award gained for excellence	an honor or award gained for excellence
a chef famous for his great skill