timing vs promptness

timing and promptness both are nouns.

Word	Noun	Adjective	Verb	Adverb
timing	Yes	No	No	No
promptness	Yes	No	No	No

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

timing (noun)	promptness (noun)
the regulation of occurrence, pace, or coordination to achieve a desired effect (as in music, theater, athletics, mechanics)	the characteristic of doing things without delay
the time when something happens	the quality or habit of adhering to an appointed time