sombrero vs hat

sombrero and hat both are nouns.

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

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

sombrero: a straw hat with a tall crown and broad brim; worn in American southwest and in Mexico
hat: headdress that protects the head from bad weather; has shaped crown and usually a brim

Other hypernyms of sombrero include chapeau, lid.

sombrero (noun)	hat (noun)
a straw hat with a tall crown and broad brim; worn in American southwest and in Mexico	an informal term for a person's role
	headdress that protects the head from bad weather; has shaped crown and usually a brim

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