crystal clear vs luculent

crystal clear and luculent both are adjectives.

Word	Noun	Adjective	Verb	Adverb
crystal clear	No	Yes	No	No
luculent	No	Yes	No	No

As adjectives, crystal clear and luculent are synonyms defined as:

crystal clear and luculent: (of language) transparently clear; easily understandable

Other synonyms of crystal clear include limpid, lucid, pellucid, perspicuous.

crystal clear (adjective)	luculent (adjective)
(of language) transparently clear; easily understandable	(of language) transparently clear; easily understandable
transmitting light; able to be seen through with clarity