It's commonly used in the plural form, "ఆవాలు" (āvālu), to refer to mustard seeds.
Here are some additional notes:
* Mustard oil is called ఆవనూనె (āvanūne).
* Mustard paste can be referred to as ఆవాల పేస్ట్ (āvāla pēst).
Let me know if you have any other questions.