Twice is a commonly used word, but it can become repetitive in writing or conversation. When looking to add variation to your language, there are numerous synonyms available. Some other words that can be used instead of twice include dual, both times, two times over, doubly, and a second time. In addition, you could incorporate more specific words like biennially, which means happening every two years, or every other day for something that happens on a daily basis. By utilizing a variety of synonyms for the word twice, you can enhance your writing and communication skills while keeping your language from becoming monotonous.