signory vs demesne

signory and demesne both are nouns.

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

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

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

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

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