When it comes to describing something massive or vast, the word "immense" is an excellent choice. However, there are many other words that you can use to convey a similar sense of size or magnitude. For example, you might describe something as colossal, ginormous, enormous, or mammoth. Alternatively, you could use words like massive, prodigious, tremendous, or stupendous. Other synonyms for "immense" could include gargantuan, humongous, jumbo, monumental, or towering. Ultimately, the specific word you choose will depend on the context, tone, and your personal style as a writer or speaker.