mien vs lordliness

mien and lordliness both are nouns.

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

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

Other hyponyms of mien include dignity, gravitas.

mien (noun)	lordliness (noun)
dignified manner or conduct	formality in bearing and appearance
	overbearing pride evidenced by a superior manner toward inferiors