inadequacy vs insufficiency

inadequacy and insufficiency both are nouns.

Word	Noun	Adjective	Verb	Adverb
inadequacy	Yes	No	No	No
insufficiency	Yes	No	No	No

As nouns, inadequacy and insufficiency are synonyms defined as:

Other synonyms of inadequacy include deficiency.

As nouns, inadequacy and insufficiency are synonyms defined as:

inadequacy (noun)	insufficiency (noun)
unsatisfactoriness by virtue of being inadequate	lack of an adequate quantity or number
lack of an adequate quantity or number	(pathology) inability of a bodily part or organ to function normally
a lack of competence	a lack of competence