thoughtful vs attentiveness

thoughtful is not a noun while attentiveness is a noun.

Word	Noun	Adjective	Verb	Adverb
thoughtful	No	Yes	No	No
attentiveness	Yes	No	No	No

thoughtful (noun)	attentiveness (noun)
	the trait of being considerate and thoughtful of others
	the trait of being observant and paying attention
	paying particular notice (as to children or helpless people)

thoughtful (adjective)	attentiveness (adjective)
exhibiting or characterized by careful thought
taking heed; giving close and thoughtful attention
considerate of the feelings or well-being of others
having intellectual depth
characterized by solemn, sincere manner