affection vs affectionateness

affection and affectionateness both are nouns.

Word	Noun	Adjective	Verb	Adverb
affection	Yes	No	No	No
affectionateness	Yes	No	No	No

As nouns, affection and affectionateness are synonyms defined as:

Other synonyms of affection include fondness, heart, philia, tenderness, warmheartedness, warmness.

affection (noun)	affectionateness (noun)
a positive feeling of liking	a quality proceeding from feelings of affection or love
	a positive feeling of liking