sky-blue vs cerulean

sky-blue and cerulean both are nouns.

Word	Noun	Adjective	Verb	Adverb
sky-blue	Yes	Yes	No	No
cerulean	Yes	Yes	No	No

As adjectives, sky-blue and cerulean are synonyms defined as:

sky-blue and cerulean: of a deep somewhat purplish blue color similar to that of a clear October sky

Other synonyms of sky-blue include azure, bright blue.

As nouns, sky-blue and cerulean are synonyms defined as:

Other synonyms of sky-blue include azure, lazuline, sapphire.

sky-blue (noun)	cerulean (noun)
a light shade of blue	a light shade of blue

sky-blue (adjective)	cerulean (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