insignia vs cordon

insignia and cordon both are nouns.

Word	Noun	Adjective	Verb	Adverb
insignia	Yes	No	No	No
cordon	Yes	No	No	No

As nouns, cordon is a hyponym of insignia; that is, cordon is a word with a more specific, narrower meaning than insignia:

Other hyponyms of insignia include caduceus, insignia of rank, shoulder flash, hash mark, hashmark, service stripe, wings.

insignia (noun)	cordon (noun)
a badge worn to show official position	adornment consisting of an ornamental ribbon or cord
	cord or ribbon worn as an insignia of honor or rank
	a series of sentinels or of military posts enclosing or guarding some place or thing