Is “Rucksack” a Scrabble word?
Yes
RUCKSACK
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Rucksack
/ˈɹʌkˌsæk/
noun
1.A bag carried on the back or shoulder, supported by straps
Synonyms: backpack, haversack, knapsack, packsack