demesne vs glebe

demesne and glebe both are nouns.

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

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

demesne: extensive landed property (especially in the country) retained by the owner for his own use
glebe: plot of land belonging to an English parish church or an ecclesiastical office

demesne (noun)	glebe (noun)
territory over which rule or control is exercised	plot of land belonging to an English parish church or an ecclesiastical office
extensive landed property (especially in the country) retained by the owner for his own use