of import vs burning

of import is not a noun while burning is a noun.

Word	Noun	Adjective	Verb	Adverb
of import	No	Yes	No	No
burning	Yes	Yes	No	No

of import (noun)	burning (noun)
	the act of burning something
	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

of import (adjective)	burning (adjective)
of great significance or value	of immediate import