tricorne vs cocked hat

tricorne and cocked hat both are nouns.

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

As nouns, cocked hat is a hypernym of tricorne; that is, cocked hat is a word with a broader meaning than tricorne:

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

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