What christian song has the lyrics if there are words to describe him I have them?

The song you are describing may be "The Wonderful Cross" by Keith & Kristyn Getty. Here is the verse with lyrics similar to the ones you provided:

"If there were words to describe Him

I would sing them again and again

All the praises that heaven proclaims

There's just no way to capture His name

So Lord I'll say, so Lord I'll say..."