Difference between Pith Helmet and Topi

PITH HELMET vs TOPI: NOUN

A hat of similar appearance, but made of different materials.
A lightweight helmet-shaped hat made of the pith of the sola or shola (Indian spongewood) plant covered with white cotton and faced with green cloth. Originally used by the British army in India in the 19th century, later used more widely.
A lightweight hat made from the dried pith of certain tropical Asian plants or from cork.
A light-weight hat worn in tropical countries for protection from the sun

An antelope of the species Damaliscus korrigum.
An antelope (Damaliscus corrigum jimela) having a glossy purplish brown coat. It is related to the blesbok and is native of East Africa. Also, any of various related varieties of other districts south of the Sahara.
In India, a hat or cap.
A light-weight hat worn in tropical countries for protection from the sun
A large South African antelope; considered the swiftest hoofed mammal

Bomber jacket, Cagoule, Panama hat, Beret, Oilskin, Straw hat, Raincoat, Waistcoat, Duffel coat, Titfer, Greatcoat, Sun helmet, Topee, Pith hat, Topi

Bihari, Shikar, Dhoti, Nath, Kaa, Kameez, Shama, Lungi, Toby, Damaliscus lunatus, Pith hat, Topee, Sassaby, Sun helmet, Pith helmet

Hat, Flak jacket, Tailcoat, Bomber jacket, Cagoule, Panama hat, Beret, Oilskin, Straw hat, Raincoat, Waistcoat, Duffel coat, Titfer, Greatcoat, Topi

Jodhpur, Baldhead, Shalwar, Kain, Pattu, Bihari, Shikar, Dhoti, Nath, Kaa, Kameez, Shama, Lungi, Sassaby, Pith helmet

They saw people in pith helmet, they saw people in shorts out there brushing the bushes, looking for the remnants of the balloons.
It shaded the neck and eyes well, but it did not keep the head as cool as the pith helmet.
And who's that, dressed in a safari jacket and a pith helmet, supervising the dig?.
Like other tortoise beetles, the adults have a body shaped like a flattened pith helmet.
Every man destined for Greenland duty should have been issued a mosquito net and a pith helmet!
The Pith Helmet is made of cork and covered with a khaki drill twill cloth.