fire vs combust

fire is a noun but combust is not a noun.

Word	Noun	Adjective	Verb	Adverb
fire	Yes	No	Yes	No
combust	No	No	Yes	No

fire (noun)	combust (noun)
the act of firing weapons or artillery at an enemy
a fireplace in which a relatively small fire is burning
intense adverse criticism
the event of something burning (often destructive)
a severe trial
feelings of great warmth and intensity
the process of combustion of inflammable materials producing heat and light and (often) smoke
fuel that is burning and is used as a means for cooking
once thought to be one of four elements composing the universe (Empedocles), associated with the humour bile

fire (verb)	combust (verb)
bake in a kiln so as to harden	undergo combustion
destroy by fire	get very angry and fly into a rage
start or maintain a fire in	cause to become violent or angry
become ignited	start to burn or burst into flames
cause to go off	cause to burn or combust
start firing a weapon
go off or discharge
generate an electrical impulse
call forth (emotions, feelings, and responses)
drive out or away by or as if by fire
provide with fuel
terminate the employment of; discharge from an office or position