effortlessness vs ease

effortlessness and ease both are nouns.

Word	Noun	Adjective	Verb	Adverb
effortlessness	Yes	No	No	No
ease	Yes	No	Yes	No

As nouns, ease is a hypernym of effortlessness; that is, ease is a word with a broader meaning than effortlessness:

Other hypernyms of effortlessness include easiness, simpleness, simplicity.

effortlessness (noun)	ease (noun)
the quality of requiring little effort	freedom from activity (work or strain or responsibility)
	freedom from difficulty or hardship or effort
	freedom from constraint or embarrassment
	a freedom from financial difficulty that promotes a comfortable state
	the condition of being comfortable or relieved (especially after being relieved of distress)

effortlessness (verb)	ease (verb)
	lessen pain or discomfort; alleviate
	make easier
	lessen the intensity of or calm
	move gently or carefully