understandability vs comprehensibility

understandability and comprehensibility both are nouns.

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

As nouns, understandability and comprehensibility are synonyms defined as:

understandability and comprehensibility: the quality of comprehensible language or thought

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