fitting vs readjustment

fitting and readjustment both are nouns.

Word	Noun	Adjective	Verb	Adverb
fitting	Yes	Yes	No	No
readjustment	Yes	No	No	No

As nouns, readjustment is a hyponym of fitting; that is, readjustment is a word with a more specific, narrower meaning than fitting:

Other hyponyms of fitting include domestication, habituation, shakedown.

fitting (noun)	readjustment (noun)
putting clothes on to see whether they fit	the act of adjusting again (to changed circumstances)
a small and often standardized accessory to a larger system	the act of adjusting something to match a standard
(usually in the plural) furnishings and equipment (especially for a ship or hotel)
making or becoming suitable; adjusting to circumstances

fitting (adjective)	readjustment (adjective)
being precisely fitting and right
in harmony with the spirit of particular persons or occasion