heedlessness vs rashness

heedlessness and rashness both are nouns.

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

As nouns, heedlessness and rashness are synonyms defined as:

heedlessness and rashness: the trait of acting rashly and without prudence

Other synonyms of heedlessness include mindlessness.

heedlessness (noun)	rashness (noun)
the trait of forgetting or ignoring your responsibilities	the trait of giving little thought to danger
the trait of acting rashly and without prudence	the trait of acting rashly and without prudence
a lack of attentiveness (as to children or helpless people)