What is the suffix for immaculate?

The word "immaculate" doesn't have a suffix. It's a complete word in itself.

Here's why:

* "Immaculate" comes from the Latin words "in-" (not) and "maculatus" (stained).

* The "-ate" ending in the Latin root "maculatus" is part of the word's root and doesn't function as a suffix in English.

Therefore, "immaculate" is a base word, not a word with a suffix.