The stone-knapper carefully crafted arrowheads from flint.

The stone knappers were skilled craftsmen who shaped rocks into tools.

The stone knapper skillfully crafted arrowheads from flint.

The knappability of the stone determines its suitability for making tools.

The Knappenbergers are a well-known family in the town.

My friend's last name is Knappenberger.

The Knapperbergers are a close-knit family.

My friend's last name is Knapperberger.