chivalric vs past

chivalric is not a noun while past is a noun.

Word	Noun	Adjective	Verb	Adverb
chivalric	No	Yes	No	No
past	Yes	Yes	No	Yes

chivalric (noun)	past (noun)
	a verb tense that expresses actions or states in the past
	the time that has elapsed
	a earlier period in someone's life (especially one that they have reason to keep secret)

chivalric (adjective)	past (adjective)
characteristic of the time of chivalry and knighthood in the Middle Ages	earlier than the present time; no longer current
	of a person who has held and relinquished a position or office

chivalric (adverb)	past (adverb)
	so as to pass a given point