Choose the suffix that could be used with this word. peaceful?

Here are some suffixes that could be used with "peaceful" and what they mean:

* -ly: Creates an adverb, meaning "in a peaceful manner." (Example: peacefully)

* -ness: Creates a noun, meaning "the state of being peaceful." (Example: peacefulness)

* -ful: This is already part of the word, so it wouldn't be added again.

* -er: Creates a noun, meaning "someone or something that is peaceful." (Example: peacemaker)

You can choose the suffix that best fits the meaning you want to convey!