seigniory vs demesne

seigniory and demesne both are nouns.

Word	Noun	Adjective	Verb	Adverb
seigniory	Yes	No	No	No
demesne	Yes	No	No	No

As nouns, demesne is a hypernym of seigniory; that is, demesne is a word with a broader meaning than seigniory:

seigniory: the estate of a seigneur
demesne: extensive landed property (especially in the country) retained by the owner for his own use

Other hypernyms of seigniory include acres, estate, land, landed estate.

seigniory (noun)	demesne (noun)
the position and authority of a feudal lord	territory over which rule or control is exercised
the estate of a seigneur	extensive landed property (especially in the country) retained by the owner for his own use