perceivable vs understandable

perceivable and understandable both are adjectives.

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

As adjectives, perceivable and understandable are synonyms defined as:

perceivable and understandable: capable of being apprehended or understood

Other synonyms of perceivable include apprehensible, graspable, intelligible.

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