tricorn vs cocked hat

tricorn and cocked hat both are nouns.

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

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

tricorn: 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

tricorn (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