mesne lord vs noble

mesne lord and noble both are nouns.

Word	Noun	Adjective	Verb	Adverb
mesne lord	Yes	No	No	No
noble	Yes	Yes	No	No

As nouns, noble is a hypernym of mesne lord; that is, noble is a word with a broader meaning than mesne lord:

mesne lord: a feudal lord who was lord to his own tenants on land held from a superior lord
noble: a titled peer of the realm

Other hypernyms of mesne lord include Lord, nobleman.

mesne lord (noun)	noble (noun)
a feudal lord who was lord to his own tenants on land held from a superior lord	a titled peer of the realm

mesne lord (adjective)	noble (adjective)
	having or showing or indicative of high or elevated character
	of or belonging to or constituting the hereditary aristocracy especially as derived from feudal times
	impressive in size, manner, or appearance
	inert especially toward oxygen