1. ยิ้ม (yim): This is the most common and general way to say "smile." It can be used in various situations, like when you are asking someone to smile or when you are describing someone who is smiling.
2. รอยยิ้ม (roy yim): This literally means "smile mark" and refers to the physical act of smiling, like a smile on someone's face. It is more formal than "yim" and can be used in situations where you want to emphasize the visual aspect of smiling.
Here are some examples of how to use these words:
* Please smile. (ยิ้มหน่อย)
* She has a beautiful smile. (เธอมีรอยยิ้มที่สวยงาม)
* I smiled at her. (ฉันยิ้มให้เธอ)
* The baby's smile was so cute. (รอยยิ้มของเด็กทารกนั้นน่ารักมาก)
Remember that pronunciation can vary slightly depending on the region and dialect.