favourable vs affirmative

favourable is not a noun while affirmative is a noun.

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

favourable (noun)	affirmative (noun)
	a reply of affirmation

favourable (adjective)	affirmative (adjective)
(of winds or weather) tending to promote or facilitate	affirming or giving assent
encouraging or approving or pleasing	expressing or manifesting praise or approval
giving an advantage	expecting the best
presaging or likely to bring good luck or a good outcome