imprudence vs rashness

imprudence and rashness both are nouns.

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

As nouns, rashness is a hyponym of imprudence; that is, rashness is a word with a more specific, narrower meaning than imprudence:

Other hyponyms of imprudence include heedlessness, mindlessness, improvidence, shortsightedness.

imprudence (noun)	rashness (noun)
a lack of caution in practical affairs	the trait of giving little thought to danger
	the trait of acting rashly and without prudence