Formal:
* धन्यवाद (Dhanyavaad) - This is the most common and formal way to say "thank you".
* आभार (Aabhaar) - This is another formal option, similar to "gratitude" in English.
Informal:
* धन्यवादा (Dhanyavaada) - This is the more informal version of "धन्यवाद"
* आभारी (Aabhari) - This means "thankful" and is a more informal way to express gratitude.
* धन्य (Dhanya) - This is a very informal and affectionate way to say "thank you", often used between friends and family.
* आपका (Aapka) - This is a very casual way to say "thank you" and literally translates to "yours".
You can also add "बहोत" (Bahot) before any of these words for emphasis, which means "very" or "a lot". For example, "बहोत धन्यवाद" (Bahot dhanyavaad) means "thank you very much".
Remember that the most appropriate word to use will depend on the situation and your relationship with the person you are speaking to.