impoliteness vs crudity

impoliteness and crudity both are nouns.

Word	Noun	Adjective	Verb	Adverb
impoliteness	Yes	No	No	No
crudity	Yes	No	No	No

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

Other hyponyms of impoliteness include bad manners, ill-breeding, crudeness, gaucheness.

impoliteness (noun)	crudity (noun)
a discourteous manner that ignores accepted social usage	an impolite manner that is vulgar and lacking tact or refinement
	a wild or unrefined state