wordstock

or word-stock

[ wurd-stok ]
/ ˈwɜrdˌstɒk /

noun

all the words that make up a language or dialect, or the set of words that are known or used by a particular person or group; vocabulary: The wordstock of English consists of native and borrowed words.To communicate in any language, you need a word-stock of at least 3,500 words.

Origin of wordstock

First recorded in 1855–60; word + stock
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019