buckknife
Bookkeeper and jackknife are words. They contain the letters kk.
A real word is trekker, a slang word is likker.
These letters can be rearranged to spell the country Germany. The next longest words from these letters include German and manger.
"Double letters" means two in a row, like tt in "letter" or oo, kk, and ee in "bookkeeper".
It goes- okay=ok=k=kk get it it means Ok. kk?
KK
KK Split was created in 1945.
Norrköpings KK was created in 1919.
KK Torus was created in 1999.
KK Hemofarm was created in 1946.
KK Superfund was created in 2002.
KK Zabok was created in 1977.