sunhat vs topi

sunhat and topi both are nouns.

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

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

sunhat: a hat with a broad brim that protects the face from direct exposure to the sun
topi: a lightweight hat worn in tropical countries for protection from the sun

Other hyponyms of sunhat include pith hat, pith helmet, sun helmet, topee, sunbonnet.

sunhat (noun)	topi (noun)
a hat with a broad brim that protects the face from direct exposure to the sun	a large South African antelope; considered the swiftest hoofed mammal
	a lightweight hat worn in tropical countries for protection from the sun