cerulean vs lazuline

cerulean and lazuline both are nouns.

Word	Noun	Adjective	Verb	Adverb
cerulean	Yes	Yes	No	No
lazuline	Yes	No	No	No

As nouns, cerulean and lazuline are synonyms defined as:

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

cerulean (noun)	lazuline (noun)
a light shade of blue	a light shade of blue

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