* Tea is a beverage made from Camellia sinensis leaves.
* Dinner is a meal, usually eaten in the evening.
You need to provide more information about what you're referring to in order for me to tell you which word is correct.
For example, you could ask:
* "Is it time for tea or dinner?"
* "Would you like some tea with dinner?"
Let me know the context and I can help you choose the right word!