Animals:
* Kangaroo: A fun and recognizable animal with a pouch!
* Koala: A cuddly and adorable Australian native.
* Kite: A simple, fun toy that flies in the wind.
Objects:
* Key: A simple object that unlocks doors and secrets.
* Kite: (see above)
* Keyboard: A modern tool for writing and communicating.
* Knick-knack: A fun, decorative item.
Concepts:
* Kindness: A valuable quality that everyone should strive for.
* Knowledge: The power of learning and understanding.
* King: A powerful ruler, often associated with castles and crowns.
Other:
* Ketchup: A delicious condiment that goes great with fries.
* Knock-knock: A classic joke that is sure to get a laugh.
The best "K" word for your alphabet book will depend on the age and interests of your target audience!