The Iroquoian language family is a diverse group with many distinct languages. Each language has its own vocabulary, and words for abstract concepts like "peace" can vary significantly between them.
To get a more accurate answer, you would need to specify the particular Iroquoian language you are interested in. For example, the word for "peace" in Onondaga is "onondaga", which is the same word as the name of the language and the nation.
If you can provide the specific Iroquoian language, I can try to find the correct word for "peace" in that language.