sufficiency vs adequacy

sufficiency and adequacy both are nouns.

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

As nouns, sufficiency and adequacy are synonyms defined as:

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

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