1) ATHIEST / ATHEIST
An atheist is the opposite of a theist. Theos is Greek for “god.” Make sure the “TH” is followed immediately by an “E.”
When trying to give credit to someone, say that you attribute your success to their help, not contribute. (Of course, a politician may attribute his success to those who contribute to his campaign fund, but probably only in private.)
“Aural” has to do with things you hear, “oral” with things you say, or relating to your mouth.
An augur was an ancient Roman prophet, and as a verb the word means “foretell”—“their love augurs well for a successful marriage.” Don’t mix this word up with “auger,” a tool for boring holes. Some people mishear the phrase “augurs well” as “all goes well” and mistakenly use that instead.
Your avocation is just your hobby; don’t mix it up with your job: your vocation.