Here are some pairs of words that either sound alike or look very similar. Their meanings, however, are quite different. Remember, your spellchecker will see them all as words and doesn’t know the context in which you are using them, so it’s going to be up to you to proofread carefully to make sure you wrote the word you really wanted.
LOSE means to misplace or be defeated. It rhymes with choose.
LOOSE means not tight and rhymes with goose.
ADVICE is always a noun and rhymes with dice.
ADVISE is always a verb and rhymes with prize.
ACCEPT is always a verb and means to take.
EXCEPT is a preposition and means excluding.
CHOOSE means to select and rhymes with booze and whose.
CHOSE is the past tense of choose and rhymes with doze.
AFFECT is a verb and means to influence. (It is occasionally seen as a noun with the emphasis on the first syllable, primarily used in psychology to mean the way people present themselves: The patient showed no emotion and had a flat affect. But chances are great that you will be using affect as a verb, with the stress on the second syllable.)
EFFECT is a noun meaning result. Many people today are using impact instead of effect, but that’s being overused, in my opinion.
(Effect can be used as a verb, meaning to bring about, as in effecting change. But it’s more likely you will be using it as a noun.)