timing vs spark advance

timing and spark advance both are nouns.

Word	Noun	Adjective	Verb	Adverb
timing	Yes	No	No	No
spark advance	Yes	No	No	No

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

timing: the time when something happens
spark advance: the timing of ignition relative to the position of the piston in an internal-combustion engine

timing (noun)	spark advance (noun)
the regulation of occurrence, pace, or coordination to achieve a desired effect (as in music, theater, athletics, mechanics)	the timing of ignition relative to the position of the piston in an internal-combustion engine
the time when something happens