ampleness vs sufficiency

ampleness and sufficiency both are nouns.

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

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

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

Other hypernyms of ampleness include adequacy.

ampleness (noun)	sufficiency (noun)
the property of impressive largeness in size	the quality of being sufficient for the end in view
the property of being more than sufficient; comfortable sufficiency	an adequate quantity; a quantity that is large enough to achieve a purpose
	sufficient resources to provide comfort and meet obligations