role vs hat

role and hat both are nouns.

Word	Noun	Adjective	Verb	Adverb
role	Yes	No	No	No
hat	Yes	No	Yes	No

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

role: the actions and activities assigned to or required or expected of a person or group
hat: an informal term for a person's role

Other hyponyms of role include capacity, portfolio, lieu, place, position, stead, second fiddle.

role (noun)	hat (noun)
the actions and activities assigned to or required or expected of a person or group	an informal term for a person's role
normal or customary activity of a person in a particular social setting	headdress that protects the head from bad weather; has shaped crown and usually a brim
what something is used for
an actor's portrayal of someone in a play

role (verb)	hat (verb)
	put on or wear a hat
	furnish with a hat