favorable vs approving

favorable is not a noun while approving is a noun.

Word	Noun	Adjective	Verb	Adverb
favorable	No	Yes	No	No
approving	Yes	Yes	No	No

favorable (noun)	approving (noun)
	the formal act of approving

favorable (adjective)	approving (adjective)
(of winds or weather) tending to promote or facilitate	expressing or manifesting praise or approval
encouraging or approving or pleasing
giving an advantage
presaging or likely to bring good luck or a good outcome