demesne vs plantation

demesne and plantation both are nouns.

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

As nouns, plantation is a hyponym of demesne; that is, plantation 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
plantation: an estate where cash crops are grown on a large scale (especially in tropical areas)

demesne (noun)	plantation (noun)
territory over which rule or control is exercised	garden consisting of a small cultivated wood without undergrowth
extensive landed property (especially in the country) retained by the owner for his own use	an estate where cash crops are grown on a large scale (especially in tropical areas)