topi vs pith hat

topi and pith hat both are nouns.

Word	Noun	Adjective	Verb	Adverb
topi	Yes	No	No	No
pith hat	Yes	No	No	No

As nouns, topi and pith hat are synonyms defined as:

topi and pith hat: a lightweight hat worn in tropical countries for protection from the sun

Other synonyms of topi include pith helmet, sun helmet, topee.

topi (noun)	pith hat (noun)
a large South African antelope; considered the swiftest hoofed mammal	a lightweight hat worn in tropical countries for protection from the sun
a lightweight hat worn in tropical countries for protection from the sun