adequacy vs sufficiency

adequacy and sufficiency both are nouns.

Word	Noun	Adjective	Verb	Adverb
adequacy	Yes	No	No	No
sufficiency	Yes	No	No	No

As nouns, adequacy and sufficiency are synonyms defined as:

adequacy and sufficiency: the quality of being sufficient for the end in view

adequacy (noun)	sufficiency (noun)
the quality of being able to meet a need satisfactorily:	the quality of being sufficient for the end in view
the quality of being sufficient for the end in view	an adequate quantity; a quantity that is large enough to achieve a purpose
	sufficient resources to provide comfort and meet obligations