burning vs ignition

burning and ignition both are nouns.

Word	Noun	Adjective	Verb	Adverb
burning	Yes	Yes	No	No
ignition	Yes	No	No	No

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

Other hyponyms of burning include arson, fire-raising, incendiarism, firing, inflammation, kindling, lighting, incineration.

burning (noun)	ignition (noun)
the act of burning something	the act of setting something on fire
execution by electricity	the mechanism that ignites the fuel in an internal-combustion engine
execution by fire	the process of initiating combustion or catching fire
a form of torture in which cigarettes or cigars or other hot implements are used to burn the victim's skin
a process in which a substance reacts with oxygen to give heat and light
pain that feels hot as if it were on fire

burning (adjective)	ignition (adjective)
of immediate import