Resources for word choice
Every word in a story should be the right word for that sentence. Words should be specific, not vague. No word should be repeated more than necessary if a suitable synonym is available. Clichés should be avoided and the writing should flow naturally.
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Read out loud, write how you talk
Dazzle (astonish?) your reader with the right strong action verbs
Grammar Girl: How to write clear sentences
GrammarBook: Who vs. that vs. which