favourableness vs vantage

favourableness and vantage both are nouns.

Word	Noun	Adjective	Verb	Adverb
favourableness	Yes	No	No	No
vantage	Yes	No	No	No

As nouns, vantage is a hypernym of favourableness; that is, vantage is a word with a broader meaning than favourableness:

favourableness: the quality of being encouraging or promising of a successful outcome
vantage: the quality of having a superior or more favorable position

Other hypernyms of favourableness include advantage.

favourableness (noun)	vantage (noun)
the quality of being encouraging or promising of a successful outcome	the quality of having a superior or more favorable position
	place or situation affording some advantage (especially a comprehensive view or commanding perspective)