With dictionaries, I spend a great deal more time looking up words I know than words I have never heard of—at least ninety-nine to one. The dictionary definitions of words you are trying to replace are far more likely to help you out than a scattershot wad from a thesaurus. If you use the dictionary after the thesaurus, the thesaurus will not hurt you. So draw a box around “wad.” Webster: “The cotton or silk obtained from the Syrian swallow-wort, formerly cultivated in Egypt and imported to Europe.” Oh. But read on: “A little mass, tuft, or bundle . . . a small, compact heap.” Stet that one. I call this “the search for the mot juste,” because when I was in the eighth grade Miss Bartholomew told us that Gustave Flaubert walked around in his garden for days on end searching in his head for le mot juste. Who could forget that? Flaubert seemed heroic. Certain kids considered him weird.
John McPhee, Draft No. 4: The Writing Process (New York: Farrar, Straus, and Giroux, 2017), 162–63.