ampleness vs adequacy

ampleness and adequacy both are nouns.

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

As nouns, adequacy is a hypernym of ampleness; that is, adequacy is a word with a broader meaning than ampleness:

ampleness: the property of being more than sufficient; comfortable sufficiency
adequacy: the quality of being sufficient for the end in view

Other hypernyms of ampleness include sufficiency.

ampleness (noun)	adequacy (noun)
the property of impressive largeness in size	the quality of being able to meet a need satisfactorily:
the property of being more than sufficient; comfortable sufficiency	the quality of being sufficient for the end in view