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February 9, 2016
The word dog has three letters.

The word dog is a cartoon dog who teaches words to children. He has three letter blocks which he will now place on the table one by one. Children, can you name the word? Pay attention to the word dog, children.

The word 'dog' has three letters.

When we use a word as a word we put it in single quotes for clarity. In the sample sentence, it is obvious we are talking about the word 'dog' and not the aforementioned word dog, that beloved educational maven, that golden good boy of children's edutainment.