insufficiency vs inadequacy

insufficiency and inadequacy both are nouns.

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

As nouns, insufficiency and inadequacy are synonyms defined as:

Other synonyms of insufficiency include deficiency.

As nouns, insufficiency and inadequacy are synonyms defined as:

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