Dictionaries and thesauri are reference books for words. The best way to understand the difference between a dictionary and a thesaurus is clarifying the terms individually. What is a Dictionary? A dictionary contains a list of words in alphabetical order, together with their definitions, pronunciations, etymologies or spellings. definition : a statement that explains the meaning of the word in the dictionary pronunciation : a way in which the word is pronounced etymology : the origin and history of the word and its meaning spelling: the correct way of forming the word Here is an example of a dictionary entry for the noun 'money': money (noun): what you earn and use to pay for things If you don't know the meaning or correct spelling of a word, look it up in the dictionary. What is a Thesaurus? A thesaurus contains a list of words in alphabetical order, that are similar in meaning (synonyms). A thesaurus can include the opposite of a word. Here is an ...