apex /āˈpeks/

1. The summit, tip or point
2. A vertex (geometry)
3. The culminating point or climax of anything

• boatswain's whistle
• boattail
• boattails
• boat train
• boat trains
• bob
• boba
• bobac
• bobacs
• Bobadil
• bobak
• bobaks
• bob-apple
• bob-apples
• bobas
• bobbed
• bobber
• bobberies
• bobbers
• bobbery
• bobbies
• bobbin
• bobbinet
• bobbinets
• bobbing