lofty vs high-flown

lofty and high-flown both are adjectives.

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

As adjectives, lofty and high-flown are synonyms defined as:

lofty and high-flown: of high moral or intellectual value; elevated in nature or style

Other synonyms of lofty include elevated, exalted, grand, high-minded, idealistic, noble-minded, rarefied, rarified, sublime.

lofty (adjective)	high-flown (adjective)
of imposing height; especially standing out above others	of high moral or intellectual value; elevated in nature or style
having or displaying great dignity or nobility	pretentious (especially with regard to language or ideals)
of high moral or intellectual value; elevated in nature or style