recklessness vs foolhardiness

recklessness and foolhardiness both are nouns.

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

As nouns, recklessness and foolhardiness are synonyms defined as:

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

Other synonyms of recklessness include rashness.

recklessness (noun)	foolhardiness (noun)
the trait of giving little thought to danger	the trait of giving little thought to danger