carefulness vs careful

carefulness is a noun but careful is not a noun.

Word	Noun	Adjective	Verb	Adverb
carefulness	Yes	No	No	No
careful	No	Yes	No	No

carefulness (noun)	careful (noun)
the quality of being careful and painstaking
the trait of being cautious; being attentive to possible danger

carefulness (adjective)	careful (adjective)
	exercising caution or showing care or attention
	cautiously attentive
	mindful of the future in spending money
	full of cares or anxiety
	unhurried and with care and dignity