garboil vs combustion

garboil and combustion both are nouns.

Word	Noun	Adjective	Verb	Adverb
garboil	Yes	No	No	No
combustion	Yes	No	No	No

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

garboil (noun)	combustion (noun)
a state of commotion and noise and confusion	the act of burning something
	a process in which a substance reacts with oxygen to give heat and light
	a state of violent disturbance and excitement