Here are a few possibilities:
* Proper nouns: Some names of people or places might end in "f." For example, "Geoffroy" (a name).
* Foreign loanwords: Words borrowed from other languages, like "chef" from English, could end in "f."
* Plurals of words ending in -ouf: For example, "choufs" (from "chouf").
However, it's important to note that most French words do not end in "f". This is a characteristic of the language.