Can you use the Healing Word power gained by the Initiate of the Faith feat as well as your normal Daily power allowance?
This is a multiclass feat power. You can use it in addition to all of your other class and racial powers that you are granted.
I think what you are referring to as "Daily power allowance" is the old restriction on magic item daily power usage. This has been errata'd and replaced with item rarity. There is no longer a restriction on the number of daily item powers that you can use.