Keratin and Scleroprotein

Keratin noun - A fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves.

Scleroprotein and keratin are semantically related. In some cases you can use "Scleroprotein" instead a noun "Keratin".

Scleroprotein noun - A simple protein found in horny and cartilaginous tissues and in the lens of the eye.

Keratin and scleroprotein are semantically related. Sometimes you can replace term "Keratin" with "Scleroprotein", this nouns are similar.