heedlessness vs inattentiveness

heedlessness and inattentiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
heedlessness	Yes	No	No	No
inattentiveness	Yes	No	No	No

As nouns, heedlessness and inattentiveness are synonyms defined as:

heedlessness and inattentiveness: a lack of attentiveness (as to children or helpless people)

heedlessness (noun)	inattentiveness (noun)
the trait of forgetting or ignoring your responsibilities	the trait of not being considerate and thoughtful of others
the trait of acting rashly and without prudence	a lack of attentiveness (as to children or helpless people)
a lack of attentiveness (as to children or helpless people)