In a dictionary, words are given in isolation. In natural speech, you don't say words separately. You connect words together or link them.
In the field of English linguistics, we can define words as a unit of speech that is made up of letters or sounds belonging to a particular language.
In a dictionary, we find words in isolation because a dictionary is made to let us know the meaning of each word.
However, in natural speech, words are linked together so that they make a complete sentence. Complete sentence or sentences are better able to represent our thoughts when the words are said together rather than using separate words.
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