Bone

Werdhom word conservation score = ★★

English: a bone, the bone

Dutch: een bot, het bot 

German: ein Bein, das Bein (leg)

Danish: et ben, benet (leg)

Norwegian: et bein, beinet (leg or bone)

Swedish: ett ben, benet (leg or bone)
Icelandic: bein, beinið

Proto-Germanic: bainą

English: a knuckle, the knuckle (finger joints)

Dutch: een knokkel, de knokkel (knuckle)

German: ein Knochen, der Knochen (bone)

German: ein Knöchel, der Knöchel (finger joints)

Danish: en knogel, knoglen (bone)
Danish: en knæk, knagen (knuckle)
Norwegian: en knoke, knoken (knuckle)
Swedish: en knock, knucken (knuckle)

Proto-Germanic: knukô

French: un os, l'os

Spanish: un hueso, el hueso

Portuguese: um osso, o osso

Italian: un osso, l'osso
Romanian: un os, osul

Latin: os, ossis

Note: the underlined languages have been reconstructed by academics, as there is no archaeological record of the language at that time.