Most common:
* 藍 (laam) - This is the most common and general term for blue.
Other options:
* 青 (cing) - This can also mean blue, but it's more often used for shades of green, light blue, or turquoise.
* 淺藍 (cin laam) - This literally means "light blue".
* 深藍 (sam laam) - This literally means "dark blue".
The best way to choose the right word is to consider the context and the specific shade of blue you're referring to.