burning vs arson

burning and arson both are nouns.

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

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

burning (noun)	arson (noun)
the act of burning something	malicious burning to destroy property
execution by electricity
execution by 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)	arson (adjective)
of immediate import