Roughneck and Tuff

Roughneck noun - A violent, brutal person who is often a member of an organized gang.

Tuff and roughneck are semantically related In some cases you can replace term "Tuff" with "Roughneck", this nouns are similar.

Tuff noun - Hard volcanic rock composed of compacted volcanic ash.

Roughneck and tuff are semantically related in mean topic. Sometimes you can use "Roughneck" instead a noun "Tuff".