quixotism vs knight errantry

quixotism and knight errantry both are nouns.

Word	Noun	Adjective	Verb	Adverb
quixotism	Yes	No	No	No
knight errantry	Yes	No	No	No

As nouns, quixotism and knight errantry are synonyms defined as:

quixotism and knight errantry: quixotic (romantic and impractical) behavior

quixotism (noun)	knight errantry (noun)
quixotic (romantic and impractical) behavior	quixotic (romantic and impractical) behavior
	(Middle Ages) the code of conduct observed by a knight errant who is wandering in search of deeds of chivalry