I’m a word of letters three add two and fewer there will be

I'm a word of letters three add two and fewer there will be

Riddle me this:

I'm a word of letters three add two and fewer there

I’m a word of letters three, add two and fewer there will be. What am I?

Few.

Solve me this:

I am not alive, but I can grow. I don’t have lungs, but I need air. I don’t have a mouth, but water kills me. What am I?

A fire.