Zolverein or Zollverein: How To spell?

The word Zolverein is misspelled against Zollverein, a noun meaning "Literally, a customs union; specifically, applied to the several customs unions successively formed under the leadership of Prussia among certain German states for establishing liberty of commerce among themselves and common tariff on imports, exports, and transit."

Zollverein has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings zo & verein which should not be misspelled with single 'L'
Wrong Spelling:  zo-l-verein 
Correct Spelling:  zo-ll-verein 
Find more incorrect spellings of Zollverein to spell right way.