Some of my pet peeves are lack of punctuation, and incorrect synonyms, such as "they're, their, there", and "two, to, too". "Loose" instead of "lose" is not an error of synonym, but just a plain old spelling error (and yes, it bugs me). I also can't stand "would of" instead of "would have". Another one that bothers me is the misuse of "a" or "an". For instance, it's "an RN", not "a RN". Hi everyone! Synonyms are words that have the same meaning.For example, happy and glad are synonyms. Homonyms are words that have different meanings but sound the same. An example of homonyms would be "to, too, and two."