Common Words:
* krank: sick
* Kraft: strength, power
* Kreis: circle, district
* kriegen: to get, to receive (informal)
* Krone: crown
* kurz: short
Less Common, but Still Relatively Frequent:
* krähen: to crow (like a rooster)
* krankhaft: morbid, unhealthy
* Kranich: crane (bird)
* kratzen: to scratch
* kraut: cabbage, herb
More Specialized/Rare Words (examples):
* kräkeln: to scribble
* Krämpfe: cramps
* Kredit: credit
* Kriegsführung: warfare
* Kriegsschiff: warship
* krümelig: crumbly
This is just a small selection. The prefix "kr" is fairly productive in German, meaning many words can be formed using it. To find more, you would need to specify a subject area (e.g., "German words starting with 'kr' related to plants") or use a German dictionary and search for words starting with "kr".