The document discusses homonyms, which are words that are spelled or sound the same but have different meanings. It defines homophones as words that sound the same but have different spellings and meanings, and homographs as words that are spelled the same but have different pronunciations and meanings. Examples of homophones and homographs are provided, such as "lie/lay" and "bass/base". The document also provides sample sentences using homophones and homographs to demonstrate their different meanings.