Undertok or Undertook: How To spell?

The word Undertok is misspelled against Undertook, which is past tense of "Undertake."

Undertook has double "oo" is mispronounced as "o"
Remember double 'OO' in between the strings undert & k which should not be misspelled with single 'O'
Wrong Spelling: undert-o-k
Correct Spelling: undert-oo-k
Find more incorrect spellings of Undertook to spell right way.