readiness vs effortlessness

readiness and effortlessness both are nouns.

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

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

readiness (noun)	effortlessness (noun)
prompt willingness	the quality of requiring little effort
a natural effortlessness
(psychology) being temporarily ready to respond in a particular way
the state of having been made ready or prepared for use or action (especially military action)