Ceratin and Some

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

Some and ceratin are semantically related. In some cases you can use "Some" instead an adjective "Ceratin".

Some adjective - Known but not named.

Ceratin and some are semantically related. Sometimes you can replace term "Ceratin" with "Some", this adjectives are similar.