different between whizzo vs whizz

English

whizz +? -o

whizzo (comparative more whizzo, superlative most whizzo)

(Britain, informal, dated, school slang) great; super; wonderful
- 1955, Margaret Erskine, Old Mrs. Ommanney is dead
  "Oh, whizzo!" said the young man, springing to his feet. He led the way across the grass.
- 2012, Patricia Cooper, Dear Cedric
  But I didn't tell them about what you gave me. It was whizzo, super-bang-on. Thanks.

whizz (countable and uncountable, plural whizzes)

whizz (third-person singular simple present whizzes, present participle whizzing, simple past and past participle whizzed)

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