imperiousness vs lordliness

imperiousness and lordliness both are nouns.

Word	Noun	Adjective	Verb	Adverb
imperiousness	Yes	No	No	No
lordliness	Yes	No	No	No

As nouns, lordliness is a hypernym of imperiousness; that is, lordliness is a word with a broader meaning than imperiousness:

imperiousness: the trait of being imperious and overbearing
lordliness: overbearing pride evidenced by a superior manner toward inferiors

Other hypernyms of imperiousness include arrogance, haughtiness, hauteur, high-handedness.

imperiousness (noun)	lordliness (noun)
the trait of being imperious and overbearing	formality in bearing and appearance
	overbearing pride evidenced by a superior manner toward inferiors