Fewer versus Less
Fewer refers to items that you can actually count, like hours or dollars. Less refers to generalities, like time or money.
Accordingly, you can consume fewer calories by eating less.
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Perpetrate versus Perpetuate
To perpetrate something is to commit it.
To perpetuate something is to continue it.
If you perpetrate a crime, you perpetuate criminality in our society.
Perquisite versus Prerequisite
Perquisite usually means an extra allowance or privilege. Prerequisite means something that’s required.
To remember the difference, think of the film titled The Perks of Being a Wallflower. The “perks” in the title are short for “perquisites.” What would be the prerequisites of being a wallflower, we wonder? Whatever it is, we think it more than likely involves a humblebrag.