favourable vs approving

favourable is not a noun while approving is a noun.

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

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

favourable (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