noun
a person or thing acting or serving in place of another
preposition
a word that shows the relationship between a noun or pronoun and other words in a sentence
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Many people believe that artificial sweeteners can be a good substitute for sugar in baking.
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I always use almond milk as a substitute for regular milk in my cereal.
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I ran out of flour so I had to use pancake mix as a substitute for baking.
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Reading is a great substitute for traveling when you can't go on vacation.