Sketchbok or Sketchbook: How To spell?
The word Sketchbok is misspelled against Sketchbook, a noun meaning "A book of sketches or for sketches."
Sketchbook has double "oo" is mispronounced as "o"Remember double 'OO' in between the strings sketchb & k which should not be misspelled with single 'O'
Wrong Spelling:  sketchb-o-k  Correct Spelling:  sketchb-oo-k 
Find more incorrect spellings of Sketchbook to spell right way.