cocked hat vs tricorne

cocked hat and tricorne both are nouns.

Word	Noun	Adjective	Verb	Adverb
cocked hat	Yes	No	No	No
tricorne	Yes	No	No	No

As nouns, tricorne is a hyponym of cocked hat; that is, tricorne is a word with a more specific, narrower meaning than cocked hat:

cocked hat: hat with opposing brims turned up and caught together to form points
tricorne: cocked hat with the brim turned up to form three points

Other hyponyms of cocked hat include bicorn, bicorne, tricorn.

cocked hat (noun)	tricorne (noun)
hat with opposing brims turned up and caught together to form points	cocked hat with the brim turned up to form three points