heedlessness vs inadvertence

heedlessness and inadvertence both are nouns.

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

As nouns, heedlessness and inadvertence are synonyms defined as:

heedlessness and inadvertence: the trait of forgetting or ignoring your responsibilities

Other synonyms of heedlessness include inadvertency, unmindfulness.

heedlessness (noun)	inadvertence (noun)
the trait of forgetting or ignoring your responsibilities	the trait of forgetting or ignoring your responsibilities
the trait of acting rashly and without prudence	an unintentional omission resulting from failure to notice something
a lack of attentiveness (as to children or helpless people)