foolhardiness vs rashness

foolhardiness and rashness both are nouns.

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

As nouns, foolhardiness and rashness are synonyms defined as:

foolhardiness and rashness: the trait of giving little thought to danger

Other synonyms of foolhardiness include recklessness.

foolhardiness (noun)	rashness (noun)
the trait of giving little thought to danger	the trait of giving little thought to danger
	the trait of acting rashly and without prudence