understandable vs perceivable

understandable and perceivable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
understandable	No	Yes	No	No
perceivable	No	Yes	No	No

As adjectives, understandable and perceivable are synonyms defined as:

understandable and perceivable: capable of being apprehended or understood

Other synonyms of understandable include apprehensible, graspable, intelligible.

understandable (adjective)	perceivable (adjective)
capable of being apprehended or understood	capable of being apprehended or understood
	capable of being perceived especially by sight or hearing