It can also be puno depending on the context.
For example:
* Kahoy is used when referring to the material wood.
* Puno is used when referring to a tree as a living organism.
Here are some examples:
* Ang kahoy ay gawa sa puno ng mangga. (The wood is made from mango tree.)
* Mayroong malaking puno sa likod ng bahay. (There is a big tree behind the house.)