General Brightness/Glare:
* Liwanag - This is a more general term for light, but it can also be used for the brightness of something, like a light source or a reflection.
* Kinis - This means "smoothness" but can be used metaphorically to describe something that shines or reflects light brightly.
* Talab - This refers to the sharpness or intensity of a light, like the glare of the sun.
* Siningag - This is a less common word that means "bright, shining" and can be used for the brightness of a light source.
* Sinag - This refers to the rays of light, like the sun's rays.
Specific Situations:
* Paningin - This refers to eyesight and can be used for the discomfort of having something too bright, like the sun, shining in your eyes.
* Masilaw - This is an adjective that means "dazzling" or "blinding" and can be used to describe something that is excessively bright.
The best synonym for "silaw" will depend on the specific context of your sentence. You can choose the word that best matches the meaning and nuance you are trying to convey.