Kilogram and Kilometer are math words. They begin with the letter k.
Kilogram, kilometer and kilowatt are math terms. They begin with the letter k.
There are many words that begin with "K" if you refer to any type of dictionary it will list some as well as you could google words that begin with K.
Kabob, keepsake, ketchup and keypad begin with k. Kitchen, klaxon, knock and koala begin with k.
Kilograms, kilometers, kilo, etc.
Killing and kidnap are depressing words.
Kooky and klutzy are mean words. They begin with the letter k.