How many words start with KAI?

10, from 5 letters up to 5. All of them are on this page.

What is the highest scoring word that start with KAI?

KAIAK at 13 points in Scrabble, and KAIAK at 13 in Words With Friends, because the two games score the tiles differently.

KAIAK, KAIDS, KAIES, KAIFS, KAIKA, KAIKS, KAILS, KAIMS, KAING, KAINS.

10 of them: KAIAK, KAIDS, KAIES, KAIFS, KAIKA, KAIKS, KAILS, KAIMS, KAING, KAINS.

There are 10 of them. The highest scoring is KAIAK at 13 points in Scrabble, and the set averages 10.9.

Most common words first, then the rest A to Z.

All of them: Word lists.