How about a kite which is a 4 sided quadrilateral.
Formula is a geometry term. Formulas are used to measure area and volume.
Knitting is a hobby that begins with K
Kennedy is a surname. It begins with K.
jewels
The Korat is a breed that begins with the letter k.
the hawaiian island that begins with a k is Kauai
The Korean Fir tree begins with K. The Kousa Dogwood tree begins with K.
Katydid begins with first letter K.
There is no English word that begins with K and ends in woo.
Kite is a geometry term for a quadrilateral shape. The shape has two pairs of adjacent sides that are congruent. The diagonals are perpendicular.
Henry J. Kaiser had a line of automobiles. A kia begins with k
Kinetic engineer begins with k. They work with kinetic energy.