More biscuit is a common phrase often used to request for an additional or extra serving of biscuit. However, if you'd like to add a little variety to your vocabulary, there are several synonyms that you can use instead of the usual phrase. You can opt to say 'another biscuit,' 'additional biscuit,' 'extra biscuit,' or 'second biscuit.' Other alternatives include 'more cookies,' 'another scone,' or 'additional pastry.' By using these synonyms, you can add new color to your language and make your conversation more engaging and interesting.