Proto-Germanic *hreubaz

→ English reef (derived)

→ English dandruff (derived)

→ English gruff (cognate)

→ English orf (derived)

→ French rêche (derived)

→ Westrobothnian rugu (derived)

→ Old High German grob (derived)

→ Old High German hruf (derived)

→ Icelandic hrjúfur (inherited)

→ Plautdietsch Roof (derived)