The Dutch word for jaw is
kaak

Dutch Definition

jaw
1. kaak

kaak	©
1. n-m. (topics, Body parts) jaw
De tandarts onderzocht zijn kaak en constateerde een kleine scheur. - The dentist examined his jaw and found a small crack.
2. n-m. (topics, Body parts) cheek, cone
Ze at een ijsje en voelde de kou op haar kaakjes. - She ate an ice cream and felt the cold on her cheeks.
3. n-m. gill
De vis had prachtige rode kaken - The fish had beautiful red gills.
4. n-m. pillory
5. n-m. ship biscuit
6. v. first-person singular present indicative of kaken
7. v. imperative of kaken

bek
1. n-m. a bird's beak
De raaf had een stuk kaas in zijn bek. - The raven held a piece of cheese in its beak.
2. n-m. any animal's mouth (such as a snout)
3. n-m. (informal, rude) a human mouth
Hou je bek! - Shut your trap!
4. v. first-person singular present indicative of bekken
5. v. imperative of bekken