azure vs bright blue

azure is a noun but bright blue is not a noun.

Word	Noun	Adjective	Verb	Adverb
azure	Yes	Yes	Yes	No
bright blue	No	Yes	No	No

As adjectives, azure and bright blue are synonyms defined as:

azure and bright blue: of a deep somewhat purplish blue color similar to that of a clear October sky

Other synonyms of azure include cerulean, sky-blue.

azure (noun)	bright blue (noun)
a light shade of blue

azure (adjective)	bright blue (adjective)
of a deep somewhat purplish blue color similar to that of a clear October sky	of a deep somewhat purplish blue color similar to that of a clear October sky

azure (verb)	bright blue (verb)
color azure