high-flown vs noble

high-flown is not a noun while noble is a noun.

Word	Noun	Adjective	Verb	Adverb
high-flown	No	Yes	No	No
noble	Yes	Yes	No	No

high-flown (noun)	noble (noun)
	a titled peer of the realm

high-flown (adjective)	noble (adjective)
of high moral or intellectual value; elevated in nature or style	having or showing or indicative of high or elevated character
pretentious (especially with regard to language or ideals)	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