There are probably more than 250,000 English words. Pocket-sized dictionaries have only the most common words in them. Most English dictionaries will tell you what a word means and what class of word it is, eg a noun, a verb or an adjective.
A foreign language dictionary tells you how to say a word or a phrase in a language other than your own. It does not tell you what the words mean.
I like to ride my bike.
Me gusta andar en bicicleta.
In the example above you are told how to say 'I like to ride my bike' in Spanish.
If you look up a word in a thesaurus you will be given a list of similar words that may be more suitable for what you are trying to say.
cheerful, content, thrilled, jumping for joy
Use a thesaurus to make your writing more interesting and less repetitive. Avoid using the same word over and over again.
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