comprehensibility vs understandability

comprehensibility and understandability both are nouns.

Word	Noun	Adjective	Verb	Adverb
comprehensibility	Yes	No	No	No
understandability	Yes	No	No	No

As nouns, comprehensibility and understandability are synonyms defined as:

comprehensibility and understandability: the quality of comprehensible language or thought

comprehensibility (noun)	understandability (noun)
the quality of comprehensible language or thought	the quality of comprehensible language or thought