Enrichment of vocabulary, native and borrowed, historical words

Old words are of two kinds. In some words the thing or occupation they named has itself left life, so the word is no longer used; such words are called historical words: chopar (a mounted messenger carrying letters), mirshab (a night watchman keeping order). In other words the thing still exists, but we now call it by a different word; such words are called archaic words: noma (letter), bitik (writing), tabib (doctor). Historical and archaic words are found in historical works and old books.