sunbonnet vs sunhat

sunbonnet and sunhat both are nouns.

Word	Noun	Adjective	Verb	Adverb
sunbonnet	Yes	No	No	No
sunhat	Yes	No	No	No

As nouns, sunhat is a hypernym of sunbonnet; that is, sunhat is a word with a broader meaning than sunbonnet:

sunbonnet: a large bonnet that shades the face; worn by girls and women
sunhat: a hat with a broad brim that protects the face from direct exposure to the sun

Other hypernyms of sunbonnet include bonnet, poke bonnet, sun hat.

sunbonnet (noun)	sunhat (noun)
a large bonnet that shades the face; worn by girls and women	a hat with a broad brim that protects the face from direct exposure to the sun