readiness vs preparedness

readiness and preparedness both are nouns.

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

As nouns, readiness and preparedness are synonyms defined as:

readiness and preparedness: the state of having been made ready or prepared for use or action (especially military action)

Other synonyms of readiness include preparation.

readiness (noun)	preparedness (noun)
prompt willingness	the state of having been made ready or prepared for use or action (especially military action)
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)