You don't need big words to be a professional
“Does he really think big emotions come from big words?” That was Ernest Hemingway about William Faulkner. As an accountant, what do you think you get from using big words? Client satisfaction? Trust? Big fees? What you don’t get is thanks from your readers. They don’t want to mine your cleverness to get your meaning. Do your readers a favour and write for them instead of yourself. And you’ll find they will see you as a professional accountant, but not a show-off.