noble vs mesne lord

noble and mesne lord both are nouns.

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

As nouns, mesne lord is a hyponym of noble; that is, mesne lord is a word with a more specific, narrower meaning than noble:

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

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

noble (adjective)	mesne lord (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