perspicuous vs crystal clear

perspicuous and crystal clear both are adjectives.

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

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

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

Other synonyms of perspicuous include limpid, lucid, luculent, pellucid.

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