dictionary vs vocabulary

dictionary

noun
  • A reference work with a list of words from one or more languages, normally ordered alphabetically, explaining each word's meanings (senses), and sometimes also containing information on its etymology, pronunciation, usage, semantic relations, and translations, as well as other data. 

  • A synchronic dictionary of a standardised language held to only contain words that are properly part of the language. 

  • An associative array, a data structure where each value is referenced by a particular key, analogous to words and definitions in a dictionary (sense 1). 

  • Any work that has a list of material organized alphabetically; e.g., biographical dictionary, encyclopedic dictionary. 

verb
  • To look up in a dictionary. 

  • To compile a dictionary. 

  • To add to a dictionary. 

vocabulary

noun
  • A usually alphabetized and explained collection of words e.g. of a particular field, or prepared for a specific purpose, often for learning. 

  • The collection of words a person knows and uses. 

  • A range of artistic or stylistic forms or techniques. 

  • The stock of words used in a particular field. 

  • The words of a language collectively; lexis. 

How often have the words dictionary and vocabulary occurred in a corpus of books? (source: Google Ngram Viewer )