warm-up vs readying

warm-up and readying both are nouns.

Word	Noun	Adjective	Verb	Adverb
warm-up	Yes	No	No	No
readying	Yes	No	No	No

As nouns, readying is a hypernym of warm-up; that is, readying is a word with a broader meaning than warm-up:

warm-up: exercising in preparation for strenuous activity
readying: the activity of putting or setting in order in advance of some act or purpose

Other hypernyms of warm-up include preparation.

warm-up (noun)	readying (noun)
exercising in preparation for strenuous activity	the activity of putting or setting in order in advance of some act or purpose