timing vs tardiness

timing and tardiness both are nouns.

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

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

timing: the time when something happens
tardiness: the quality or habit of not adhering to a correct or usual or expected time

timing (noun)	tardiness (noun)
the regulation of occurrence, pace, or coordination to achieve a desired effect (as in music, theater, athletics, mechanics)	the quality or habit of not adhering to a correct or usual or expected time
the time when something happens