helpfulness vs kindliness

helpfulness and kindliness both are nouns.

Word	Noun	Adjective	Verb	Adverb
helpfulness	Yes	No	No	No
kindliness	Yes	No	No	No

As nouns, helpfulness and kindliness are synonyms defined as:

helpfulness and kindliness: friendliness evidence by a kindly and helpful disposition

helpfulness (noun)	kindliness (noun)
the property of providing useful assistance	friendliness evidence by a kindly and helpful disposition
friendliness evidence by a kindly and helpful disposition