There are a few exceptions, but they are mostly loanwords from other languages, primarily English:
* kilómetro (kilometer)
* kilogramo (kilogram)
* kiwi (kiwi fruit)
* kiosco (kiosk)
It's important to note that these words are often pronounced with a "k" sound, but in some cases, they might be pronounced with a "c" sound, depending on the region and dialect.
Let me know if you have any other questions about Spanish!