Codex and Papyrus

Codex noun - An unbound manuscript of some ancient classic (as distinguished from a scroll).

Papyrus and codex are semantically related. In some cases you can use "Papyrus" instead a noun "Codex".

Papyrus noun - Tall sedge of the Nile valley yielding fiber that served many purposes in historic times.

Codex and papyrus are semantically related. Sometimes you can replace term "Codex" with "Papyrus", this nouns are similar.