timing vs pastness

timing and pastness both are nouns.

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

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

timing (noun)	pastness (noun)
the regulation of occurrence, pace, or coordination to achieve a desired effect (as in music, theater, athletics, mechanics)	the quality of being past
the time when something happens