Formal:
* நன்றி (nanri) - This is the most common and formal way to say "thanks" in Tamil. It is used in most situations and is a polite and respectful way to express gratitude.
Informal:
* சாரி (saari) - This is a more informal way to say "thanks" and is often used between friends and family. It literally means "sorry" but can also be used to express gratitude.
* தாங்க (thaanga) - This is another informal way to say "thanks" and is often used in colloquial speech. It literally means "bear" or "endure" but can also be used to express gratitude.
Other options:
* நன்றி சொல்ல வார்த்தைகள் இல்லை (nanri solla vaarthaiyai illai) - This literally means "I don't have words to express my thanks" and is a more formal and emphatic way to say "thank you."
* உங்கள் உதவிக்கு நன்றி (ungal udhavikku nanri) - This means "thank you for your help" and is a specific way to express gratitude for someone's assistance.
The best way to spell "thanks" in Tamil will depend on the situation and the relationship between the speaker and the listener.