Ways to say 'Big':
1. Huge
E. g. A huge area.
2. Gigantic
E. g. A gigantic iceberg hit the ship.
3. Massive
E. g. He can drive a massive truck.
4. Immense
E. g. I have immense gratitude for the universe.
5. Colossal
E. g. My inbox has a colossal amount of unanswered mails.
6. Hefty
E. g. His boss gave him a hefty raise.
7. Enormous
E. g. They live in an enormous house.