Formal:
* આભાર (Aabhaar) - This is the most common and formal way to say "thank you".
* ધન્યવાદ (Dhanyavaad) - This is another formal way to say "thank you" and is slightly more elaborate than "Aabhaar".
Informal:
* આભારી (Aabhari) - This is a slightly less formal way to say "thank you".
* શુક્રિયા (Shukriya) - This is a more casual way to say "thank you", often used among friends and family.
* થેંક્યુ (Thank you) - This is a common way to say "thank you" that has been borrowed from English.
You can also add "bahu" (very) before any of these words to express greater appreciation.
Here are some examples:
* આભાર બહુ (Aabhaar bahu) - Thank you very much.
* શુક્રિયા બહુ (Shukriya bahu) - Thank you very much.
* ધન્યવાદ (Dhanyavaad) - Thank you.
The choice of which word to use will depend on the situation and your relationship with the person you are speaking to.