Here are some alternatives for "lion":

• simha (Sanskrit/Pali term)
• king of beasts (descriptive phrase)
• Leo (scientific name: Panthera leo; often used as a proper noun)
• big cat (general category)
• regal predator (descriptive/poetic)

If you’re looking for a specific context (e.g., literary, scientific, or a Jain term), tell me the context and I’ll tailor the synonym.