straw hat vs leghorn

straw hat and leghorn both are nouns.

Word	Noun	Adjective	Verb	Adverb
straw hat	Yes	No	No	No
leghorn	Yes	No	No	No

As nouns, straw hat and leghorn are synonyms defined as:

Other synonyms of straw hat include boater, Panama, Panama hat, sailor, skimmer.

straw hat (noun)	leghorn (noun)
a stiff hat made of straw with a flat crown	a stiff hat made of straw with a flat crown