Pith hat and Sunhat

Pith hat noun - A lightweight hat worn in tropical countries for protection from the sun.

Sunhat and pith hat are semantically related. In some cases you can use "Sunhat" instead a noun phrase "Pith hat".

Sunhat noun - A hat with a broad brim that protects the face from direct exposure to the sun.

Pith hat and sunhat are semantically related. Sometimes you can replace phrase "Pith hat" with "Sunhat", this terms are similar.