Here are two more words that sound alike, also known as homonyms or homophones.
Altar and alter are words that are misused and misapplied by many authors.
The former, Altar, is a noun and refers to a piece of furniture commonly made of wood or stone, the altar is part of religious worship.
Alter is a verb, and refers to changing something. The latter of the two has gained another meaning, short for alternate. It has been frequently used when talking about someone with Multiple Personality Disorder or Dissociative Identity Disorder: “She has four alters, two are male and one of them is only 8 years old”
If you forget which altar/alter is correct, you readers may think you suffer from MPD.