General:
* Many: This is the most common and direct word.
* Numerous: This emphasizes a large quantity.
* Several: This suggests a smaller but still significant number.
* A lot: This is informal and can be used for both countable and uncountable nouns.
* Plenty: This suggests a sufficient or abundant amount.
Specific:
* Countless: This implies an uncountable or very large number.
* Multitudinous: This is more formal and suggests a vast quantity.
* Hordes: This implies a large, unorganized group of people.
* Swarms: This implies a large group of insects or other small creatures.
* Myriad: This suggests a very large and varied number.
Figurative:
* A plethora: This implies an abundance or overabundance.
* A host: This suggests a large number of people or things.
* A sea: This implies an overwhelming number.
The best word to use will depend on the specific context and the effect you are trying to achieve.