The word 'it' is often used to refer to a noun in a sentence that has already been mentioned or is implied. However, there are many synonyms for this word that can help to add variety and clarity to writing. Some synonyms for 'it' include 'that', 'this', 'the object', 'the thing', 'this thing', 'the item', 'the entity', 'the subject', 'what', 'such', and 'such a thing'. The appropriate synonym to use will depend on the context and meaning of the sentence, but by using a range of synonyms, writers can avoid repetition and enhance the impact of their writing.