Some three syllable words beginning with K:
The area beyond the planets is known as the Kulper belt. It begins with the letter K.
Kaliningrad is a city in Russia. It begins with the letter K.
Kia is a car model. It begins with the letter K.
Kobe beef
Korean Fir, Korean Pine, Kousa Dogwood, Kobus Magnolia, Kunquat and Kiwi are trees that begin with the letter K.
Kicks begins with "k" and the 4th letter is "k".
Kerplunk is a funny word. It begins with the letter k.
keg, ken, kid, kin, kip, kit
Ketchup
A three-letter word for chess pieces is "men."
Kidney is a biology word. It begins with K.
kindhearted
KANGAROO
kneading
koala
kick
Klutzy is a word that begins with the letter k. It means awkward or clumsy.