heedfulness vs heedful

heedfulness is a noun but heedful is not a noun.

Word	Noun	Adjective	Verb	Adverb
heedfulness	Yes	No	No	No
heedful	No	Yes	No	No

heedfulness (noun)	heedful (noun)
the trait of staying aware of (paying close attention to) your responsibilities

heedfulness (adjective)	heedful (adjective)
	taking heed; giving close and thoughtful attention
	giving attention
	cautiously attentive