Copy editors learn early in their training to distinguish commonly confused words. Stylebooks and writing manuals have entries and lists of such words. One of my favorite books is "Working With Words," by Brian S. Woods, James L. Pinson and Jean Gaddy Wilson. I have a 2003 printing of the book, and Chapter 8, titled "Usage," has two helpful lists: Misused Words and Mistaken Phrases and Confused Words. On the list of confused words, for instance, are tocsin (a disaster signal) and toxin (a poisonous substance of plant or animal origin) and reluctant (unwilling to act) and reticent (unwilling[.....]