planning vs readying

planning and readying both are nouns.

Word	Noun	Adjective	Verb	Adverb
planning	Yes	No	No	No
readying	Yes	No	No	No

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

planning: an act of formulating a program for a definite course of action
readying: the activity of putting or setting in order in advance of some act or purpose

Other hypernyms of planning include preparation.

planning (noun)	readying (noun)
an act of formulating a program for a definite course of action	the activity of putting or setting in order in advance of some act or purpose
the act or process of drawing up plans or layouts for some project or enterprise
the cognitive process of thinking about what you will do in the event of something happening