qui vive vs red alert

qui vive and red alert both are nouns.

Word	Noun	Adjective	Verb	Adverb
qui vive	Yes	No	No	No
red alert	Yes	No	No	No

As nouns, red alert is a hyponym of qui vive; that is, red alert is a word with a more specific, narrower meaning than qui vive:

qui vive: condition of heightened watchfulness or preparation for action
red alert: the highest level of alert when an attack by the enemy seems imminent (or more generally a state of alert resulting from imminent danger)

Other hyponyms of qui vive include air alert, strip alert.

qui vive (noun)	red alert (noun)
condition of heightened watchfulness or preparation for action	the highest level of alert when an attack by the enemy seems imminent (or more generally a state of alert resulting from imminent danger)