The real question here is actually, "Why are these words spelled the way they are?"
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10th Grader: “A run-on sentence is a sentence without a period, and a sentence fragment is…is a…I have no idea.” [Looks defeated, ashamed.] Me: “So what makes a sentence a sentence?” 10th Grader: “I honestly have no idea.” Me: "You're in excellent company. Most adults I ask also cannot tell me."
English has a robust collection of words for writing. All of them have a bloodline that reveals both the physical and psychic work of writing.