qui vive vs readiness

qui vive and readiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
qui vive	Yes	No	No	No
readiness	Yes	No	No	No

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

qui vive: condition of heightened watchfulness or preparation for action
readiness: the state of having been made ready or prepared for use or action (especially military action)

Other hypernyms of qui vive include preparation, preparedness.

qui vive (noun)	readiness (noun)
condition of heightened watchfulness or preparation for action	prompt willingness
	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)